Mission Impossible: Hardening Android for Security and Privacy

Updates: See the Changes section for a list of changes since initial posting.

This post has been updated further by the November 2016 Refresh of the same idea

Executive Summary

The future is here, and ahead of schedule. Come join us, the weather's nice.

This blog post describes the installation and configuration of a prototype of a secure, full-featured, Android telecommunications device with full Tor support, individual application firewalling, true cell network baseband isolation, and optional ZRTP encrypted voice and video support. ZRTP does run over UDP which is not yet possible to send over Tor, but we are able to send SIP account login and call setup over Tor independently.

The SIP client we recommend also supports dialing normal telephone numbers if you have a SIP gateway that provides trunking service.

Aside from a handful of binary blobs to manage the device firmware and graphics acceleration, the entire system can be assembled (and recompiled) using only FOSS components. However, as an added bonus, we will describe how to handle the Google Play store as well, to mitigate the two infamous Google Play Backdoors.


Android is the most popular mobile platform in the world, with a wide variety of applications, including many applications that aid in communications security, censorship circumvention, and activist organization. Moreover, the core of the Android platform is Open Source, auditable, and modifiable by anyone.

Unfortunately though, mobile devices in general and Android devices in particular have not been designed with privacy in mind. In fact, they've seemingly been designed with nearly the opposite goal: to make it easy for third parties, telecommunications companies, sophisticated state-sized adversaries, and even random hackers to extract all manner of personal information from the user. This includes the full content of personal communications with business partners and loved ones. Worse still, by default, the user is given very little in the way of control or even informed consent about what information is being collected and how.

This post aims to address this, but we must first admit we stand on the shoulders of giants. Organizations like Cyanogen, F-Droid, the Guardian Project, and many others have done a great deal of work to try to improve this situation by restoring control of Android devices to the user, and to ensure the integrity of our personal communications. However, all of these projects have shortcomings and often leave gaps in what they provide and protect. Even in cases where proper security and privacy features exist, they typically require extensive configuration to use safely, securely, and correctly.

This blog post enumerates and documents these gaps, describes workarounds for serious shortcomings, and provides suggestions for future work.

It is also meant to serve as a HOWTO to walk interested, technically capable people through the end-to-end installation and configuration of a prototype of a secure and private Android device, where access to the network is restricted to an approved list of applications, and all traffic is routed through the Tor network.

It is our hope that this work can be replicated and eventually fully automated, given a good UI, and rolled into a single ROM or ROM addon package for ease of use. Ultimately, there is no reason why this system could not become a full fledged off the shelf product, given proper hardware support and good UI for the more technical bits.

The remainder of this document is divided into the following sections:

  1. Hardware Selection
  2. Installation and Setup
  3. Google Apps Setup
  4. Recommended Software
  5. Device Backup Procedure
  6. Removing the Built-in Microphone
  7. Removing Baseband Remnants
  8. Future Work
  9. Changes Since Initial Posting

Hardware Selection

If you truly wish to secure your mobile device from remote compromise, it is necessary to carefully select your hardware. First and foremost, it is absolutely essential that the carrier's baseband firmware is completely isolated from the rest of the platform. Because your cell phone baseband does not authenticate the network (in part to allow roaming), any random hacker with their own cell network can exploit these backdoors and use them to install malware on your device.

While there are projects underway to determine which handsets actually provide true hardware baseband isolation, at the time of this writing there is very little public information available on this topic. Hence, the only safe option remains a device with no cell network support at all (though cell network connectivity can still be provided by a separate device). For the purposes of this post, the reference device is the WiFi-only version of the 2013 Google Nexus 7 tablet.

For users who wish to retain full mobile access, we recommend obtaining a cell modem device that provides a WiFi access point for data services only. These devices do not have microphones and in some cases do not even have fine-grained GPS units (because they are not able to make emergency calls). They are also available with prepaid plans, for rates around $20-30 USD per month, for about 2GB/month of 4G data. If coverage and reliability is important to you though, you may want to go with a slightly more expensive carrier. In the US, T-Mobile isn't bad, but Verizon is superb.

To increase battery life of your cell connection, you can connect this access point to an external mobile USB battery pack, which typically will provide 36-48 hours of continuous use with a 6000mAh battery.

The total cost of a Wifi-only tablet with cell modem and battery pack is only roughly USD $50 more than the 4G LTE version of the same device.

In this way, you achieve true baseband isolation, with no risk of audio or network surveillance, baseband exploits, or provider backdoors. Effectively, this cell modem is just another untrusted router in a long, long chain of untrustworthy Internet infrastructure.

However, do note though that even if the cell unit does not contain a fine-grained GPS, you still sacrifice location privacy while using it. Over an extended period of time, it will be possible to make inferences about your physical activity, behavior and personal preferences, and your identity, based on cell tower use alone.

Installation and Setup

We will focus on the installation of Cyanogenmod 11 using Team Win Recovery Project, both to give this HOWTO some shelf life, and because Cyanogenmod 11 features full SELinux support (Dear NSA: What happened to you guys? You used to be cool. Well, some of you. Some of the time. Maybe. Or maybe not).

The use of Google Apps and Google Play services is not recommended due to security issues with Google Play. However, we do provide workarounds for mitigating those issues, if Google Play is required for your use case.

Installation and Setup: ROM and Core App Installation

With the 2013 Google Nexus 7 tablet, installation is fairly straight-forward. In fact, it is actually possible to install and use the device before associating it with a Google Account in any way. This is a desirable property, because by default, the otherwise mandatory initial setup process of the stock Google ROM sends your device MAC address directly to Google and links it to your Google account (all without using Tor, of course).

The official Cyanogenmod installation instructions are available online, but with a fresh out of the box device, here are the key steps for installation without activating the default ROM code at all (using Team Win Recovery Project instead of ClockWorkMod).

First, on your desktop/laptop computer (preferably Linux), perform the following:

  1. Download the latest CyanogenMod 11 release (we used cm-11-20140504-SNAPSHOT-M6)
  2. Download the latest Team Win Recovery Project image (we used
  3. Download the F-Droid package (we used 0.66)
  4. Download the Orbot package from F-Droid (we used 13.0.7)
  5. Download the Droidwall package from F-Droid (we used 1.5.7)
  6. Download the Droidwall Firewall Scripts attached to this blogpost
  7. Download the Google Apps for Cyanogenmod 11 (optional)

Because the download integrity for all of these packages is abysmal, here is a signed set of SHA256 hashes I've observed for those packages.

Once you have all of those packages, boot your tablet into fastboot mode by holding the Power button and the Volume Down button during a cold boot. Then, attach it to your desktop/laptop machine with a USB cable and run the following commands from a Linux/UNIX shell:

apt-get install android-tools-adb android-tools-fastboot
fastboot devices
fastboot oem unlock
fastboot flash recovery openrecovery-twrp-

After the recovery firmware is flashed successfully, use the volume keys to select Recovery and hit the power button to reboot the device (or power it off, and then boot holding Power and Volume Up).

Once Team Win boots, go into Wipe and select Advanced Wipe. Select all checkboxes except for USB-OTG, and slide to wipe. Once the wipe is done, click Format Data. After the format completes, issue these commands from your Linux shell:

adb server start
adb push cm-11-20140504-SNAPSHOT-M6-flo.zip /sdcard/
adb push gapps-kk-20140105-signed.zip /sdcard/ # Optional

After this push process completes, go to the Install menu, and select the Cyanogen zip, and optionally the gapps zip for installation. Then click Reboot, and select System.

After rebooting into your new installation, skip all CyanogenMod and Google setup, disable location reporting, and immediately disable WiFi and turn on Airplane mode.

Then, go into Settings -> About Tablet and scroll to the bottom and click the greyed out Build number 5 times until developer mode is enabled. Then go into Settings -> Developer Options and turn on USB Debugging.

After that, run the following commands from your Linux shell:

adb install FDroid.apk
adb install org.torproject.android_86.apk
adb install com.googlecode.droidwall_157.apk

You will need to approve the ADB connection for the first package, and then they should install normally.

VERY IMPORTANT: Whenever you finish using adb, always remember to disable USB Debugging and restore Root Access to Apps only. While Android 4.2+ ROMs now prompt you to authorize an RSA key fingerprint before allowing a debugging connection (thus mitigating adb exploit tools that bypass screen lock and can install root apps), you still risk additional vulnerability surface by leaving debugging enabled.

Installation and Setup: Initial Configuration

After the base packages are installed, go into the Settings app, and make the following changes:

  1. Wireless & Networks More... =>
  • Temporarily Disable Airplane Mode
  • NFC -> Disable
  • Re-enable Airplane Mode

  • Location Access -> Off
  • Security =>
    • PIN screen Lock
    • Allow Unknown Sources (For F-Droid)

  • Language & Input =>
    • Spell Checker -> Android Spell Checker -> Disable Contact Names
    • Disable Google Voice Typing/Hotword detection
    • Android Keyboard (AOSP) =>
      • Disable AOSP next-word suggestion (do this first!)
      • Auto-correction -> Off

  • Backup & reset =>
    • Enable Back up my data (just temporarily, for the next step)
    • Uncheck Automatic restore
    • Disable Backup my data

  • About Tablet -> Cyanogenmod Statistics -> Disable reporting
  • Developer Options -> Device Hostname -> localhost
  • SuperUser -> Settings (three dots) -> Notifications -> Notification (not toast)
  • Privacy -> Privacy Guard =>

    • Enabled by default
    • Settings (three dots) -> Show Built In Apps
    • Enable Privacy Guard for every app with the following exceptions:
      • Calendar
      • Config Updater
      • Google Account Manager (long press)
        • Modify Settings -> Off
        • Wifi Change -> Off
        • Data Change -> Off
      • Google Play Services (long press)
        • Location -> Off
        • Modify Settings -> Off
        • Draw on top -> Off
        • Record Audio -> Off
        • Wifi Change -> Off
      • Google Play Store (long press)
        • Location -> Off
        • Send SMS -> Off
        • Modify Settings -> Off
        • Data change -> Off
      • Google Services Framework (long press)
        • Modify Settings -> Off
        • Wifi Change -> Off
        • Data Change -> Off
      • Trebuchet

    Now, it is time to encrypt your tablet. It is important to do this step early, as I have noticed additional apps and configuration tweaks can make this process fail later on.

    We will also do this from the shell, in order to set a different password than your screen unlock pin. This is done to mitigate the risk of compromise of this password from shoulder surfers, and to allow the use of a much longer (and non-numeric) password that you would prefer not to type every time you unlock the screen.

    To do this, open the Terminal app, and type the following commands:

    vdc cryptfs enablecrypto inplace NewMoreSecurePassword

    Watch for typos! That command does not ask you to re-type that password for confirmation.

    Installation and Setup: Disabling Invasive Apps and Services

    Before you configure the Firewall or enable the network, you likely want to disable at least a subset of the following built-in apps and services, by using Settings -> Apps -> All, and then clicking on each app and hitting the Disable button:

    • com.android.smspush
    • com.google.android.voicesearch
    • Face Unlock
    • Google Backup Transport
    • Google Calendar Sync
    • Google One Time Init
    • Google Partner Setup
    • Google Contacts Sync
    • Google Search
    • Hangouts
    • Market Feedback Agent
    • News & Weather
    • One Time Init
    • Picasa Updater
    • Sound Search for Google Play
    • TalkBack

    Installation and Setup: Tor and Firewall configuration

    Ok, now let's install the firewall and tor support scripts. Go back into Settings -> Developer Options and enable USB Debugging and change Root Access to Apps and ADB. Then, unzip the android-firewall.zip on your laptop, and run the installation script:


    That firewall installation provides several key scripts that provide functionality that is currently impossible to achieve with any app (including Orbot):

    1. It installs a userinit script to block all network access during boot.
    2. It disables "Google Captive Portal Detection", which involves connection attempts to Google servers upon Wifi assocation (these requests are made by the Android Settings UID, which should normally be blocked from the network, unless you are first registering for Google Play).
    3. It contains a Droidwall script that configures Tor transproxy rules to send all of your traffic through Tor. These rules include a fix for a Linux kernel Tor transproxy packet leak issue.
    4. The main firewall-torify-all.sh Droidwall script also includes an input firewall, to block all inbound connections to the device. It also fixes a Droidwall permissions vulnerability
    5. It installs an optional script to allow the Browser app to bypass Tor for logging into WiFi captive portals.
    6. It installs an optional script to temporarily allow network adb access when you need it (if you are paranoid about USB exploits, which you should be).
    7. It provides an optional script to allow the UDP activity of LinPhone to bypass Tor, to allow ZRTP-encrypted Voice and Video SIP/VoIP calls. SIP account login/registration and call setup/signaling can be done over TCP, and Linphone's TCP activity is still sent through Tor with this script.

    Note that with the exception of the userinit network blocking script, installing these scripts does not activate them. You still need to configure Droidwall to use them.

    We use Droidwall instead of Orbot or AFWall+ for five reasons:

    1. Droidwall's app-based firewall and Orbot's transproxy are known to conflict and reset one another.
    2. Droidwall does not randomly drop transproxy rules when switching networks (Orbot has had several of these types of bugs).
    3. Unlike AFWall+, Droidwall is able to auto-launch at "boot" (though still not before the network and Android Services come online and make connections).
    4. AFWall+'s "fix" for this startup data leak problem does not work on Cyanogenmod (hence our userinit script instead).
    5. Aside from the permissions issue fixed by our firewall-torify-all.sh script, AFWall+ provides no additional security fixes over the stock Droidwall.

    To make use of the firewall scripts, open up Droidwall and hit the config button (the vertical three dots), go to More -> Set Custom Script. Enter the following:

    . /data/local/firewall-torify-all.sh
    #. /data/local/firewall-allow-adb.sh
    #. /data/local/firewall-allow-linphone-udp.sh
    #. /data/local/firewall-allow-nontor-browser.sh

    NOTE: You must not make any typos in the above. If you mistype any of those files, things may break. Because the userinit.sh script blocks all network at boot, if you make a typo in the torify script, you will be unable to use the Internet at all!

    Also notice that these scripts have been installed into a readonly root directory. Because they are run as root, installing them to a world-writable location like /sdcard/ is extremely unwise.

    Later, if you want to enable one of network adb, LinPhone UDP, or captive portal login, go back into this window and remove the leading comment ('#') from the appropriate lines (this is obviously one of the many aspects of this prototype that could benefit from real UI).

    Then, configure the apps you want to allow to access the network. Note that the only Android system apps that must access the network are:

    • CM Updater
    • Downloads, Media Storage, Download Manager
    • F-Droid

    Orbot's network access is handled via the main firewall-torify-all.sh script. You do not need to enable full network access to Orbot in Droidwall.

    The rest of the apps you can enable at your discretion. They will all be routed through Tor automatically.

    Once Droidwall is configured, you can click on the Menu (three dots) and click the "Firewall Disabled" button to enable the firewall. Then, you can enable Orbot. Do not grant Orbot superuser access. It still opens the transproxy ports you need without root, and Droidwall is managing installation of the transproxy rules, not Orbot.

    You are now ready to enable Wifi and network access on your device. For vulnerability surface reduction, you may want to use the Advanced Options -> Static IP to manually enter an IP address for your device to avoid using dhclient. You do not need a DNS server, and can safely set it to

    Google Apps Setup

    If you installed the Google Apps zip, you need to do a few things now to set it up, and to further harden your device. If you opted out of Google Apps, you can skip to the next section.

    Google Apps Setup: Initializing Google Play

    The first time you use Google Play, you will need to enable four apps in Droidwall: "Google Account Manager, Google Play Services...", "Settings, Dev Tools, Fused Location...", "Gmail", and "Google Play" itself.

    If you do not have a Google account, your best bet is to find open wifi to create one, as Google will often block accounts created through Tor, even if you use an Android device.

    After you log in for the first time, you should be able to disable the "Google Account Manager, Google Play Services...", "Gmail", and the "Settings..." apps in Droidwall, but your authentication tokens in Google Play may expire periodically. If this happens, you should only need to temporarily enable the "Google Account Manager, Google Play Services..." app in Droidwall to obtain new ones.

    Google Apps Setup: Mitigating the Google Play Backdoors

    If you do choose to use Google Play, you need to be very careful about how you allow it to access the network. In addition to the risks associated with using a proprietary App Store that can send you targeted malware-infected packages based on your Google Account, it has at least two major user experience flaws:

    1. Anyone who is able to gain access to your Google account can silently install root or full permission apps without any user interaction what-so-ever. Once installed, these apps can retroactively clear what little installation notification and UI-based evidence of their existence there was in the first place.
    2. The Android Update Process does not inform the user of changes in permissions of pending update apps that happen to get installed after an Android upgrade.

    The first issue can be mitigated by ensuring that Google Play does not have access to the network when not in use, by disabling it in Droidwall. If you do not do this, apps can be installed silently behind your back. Welcome to the Google Experience.

    For the second issue, you can install the SecCheck utility, to monitor your apps for changes in permissions during a device upgrade.

    Google Apps Setup: Disabling Google Cloud Messaging

    If you have installed the Google Apps zip, you have also enabled a feature called Google Cloud Messaging.

    The Google Cloud Messaging Service allows apps to register for asynchronous remote push notifications from Google, as well as send outbound messages through Google.

    Notification registration and outbound messages are sent via the app's own UID, so using Droidwall to disable network access by an app is enough to prevent outbound data, and notification registration. However, if you ever allow network access to an app, and it does successfully register for notifications, these notifications can be delivered even when the app is once again blocked from accessing the network by Droidwall.

    These inbound notifications can be blocked by disabling network access to the "Google Account Manager, Google Play Services, Google Services Framework, Google Contacts Sync" in Droidwall. In fact, the only reason you should ever need to enable network access by this service is if you need to log in to Google Play again if your authentication tokens ever expire.

    If you would like to test your ability to control Google Cloud Messaging, there are two apps in the Google Play store than can help with this. GCM Test allows for simple send and receive pings through GCM. Push Notification Tester will allow you to test registration and asynchronous GCM notification.

    Recommended Privacy and Auditing Software

    Ok, so now that we have locked down our Android device, now for the fun bit: secure communications!

    We recommend the following apps from F-Droid:

    1. Xabber
    2. Xabber is a full Java implementation of XMPP, and supports both OTR and Tor. Its UI is a bit more streamlined than Guardian Project's ChatSecure, and it does not make use of any native code components (which are more vulnerable to code execution exploits than pure Java code). Unfortunately, this means it lacks some of ChatSecure's nicer features, such as push-to-talk voice and file transfer.

      Despite better protection against code execution, it does have several insecure default settings. In particular, you want to make the following changes:

    • Notifications -> Message text in Notifications -> Off (notifications can be read by other apps!)
    • Accounts -> Integration into system accounts -> Off
    • Accounts -> Store message history -> Don't Store
    • Security -> Store History -> Off
    • Security -> Check Server Certificate
    • Chat -> Show Typing Notifications -> Off
    • Connection Settings -> Auto-away -> disabled
    • Connection Settings -> Extended away when idle -> Disabled
    • Keep Wifi Awake -> On
    • Prevent sleep Mode -> On

  • Offline Calendar
  • Offline Calendar is a hack to allow you to create a fake local Google account that does not sync to Google. This allows you to use the Calendar App without risk of leaking your activities to Google. Note that you must exempt both this app and Calendar from Privacy Guard for it to function properly.

  • LinPhone
  • LinPhone is a FOSS SIP client that supports TCP TLS signaling and ZRTP. Note that neither TLS nor ZRTP are enabled by default. You must manually enable them in Settings -> Network -> Transport and Settings -> Network -> Media Encryption.

    ostel.co is a free SIP service run by the Guardian Project that supports only TLS and ZRTP, but does not allow outdialing to normal PSTN telephone numbers. While Bitcoin has many privacy issues of its own, the Bitcoin community maintains a couple lists of "trunking" providers that allow you to obtain a PSTN phone number in exchange for Bitcoin payment.

  • Plumble

    Plumble is a Mumble client that will route voice traffic over Tor, which is useful if you would like to communicate with someone over voice without revealing your IP to them, or your activity to a local network observer. However, unlike Linphone, voice traffic is not end-to-end encrypted, so the Mumble server can listen to your conversations.

  • K-9 Mail and APG
    K-9 Mail is a POP/IMAP client that supports TLS and integrates well with APG, which will allow you to send and receive GPG-encrypted mail easily. Before using it, you should be aware of two things: It identifies itself in your mail headers, which opens you up to targeted attacks specifically tailored for K-9 Mail and/or Android, and by default it includes the subject of messages in mail notifications (which is bad, because other apps can read notifications). There is a privacy option to disable subject text in notifications, but there is no option to disable the user agent in the mail headers.
  • OSMAnd~
  • A free offline mapping tool. While the UI is a little clunky, it does support voice navigation and driving directions, and is a handy, private alternative to Google Maps.

  • VLC

    The VLC port in F-Droid is a fully capable media player. It can play mp3s and most video formats in use today. It is a handy, private alternative to Google Music and other closed-source players that often report your activity to third party advertisers. VLC does not need network access to function.

  • Firefox
  • We do not yet have a port of Tor Browser for Android (though one is underway -- see the Future Work section). Unless you want to use Google Play to get Chrome, Firefox is your best bet for a web browser that receives regular updates (the built in Browser app does not). HTTPS-Everywhere and NoScript are available, at least.

  • Bitcoin
  • Bitcoin might not be the most private currency in the world. In fact, you might even say it's the least private currency in the world. But, it is a neat toy.

  • Launch App Ops

    The Launch App Ops app is a simple shortcut into the hidden application permissions editor in Android. A similar interface is available through Settings -> Privacy -> Privacy Guard, but a direct shortcut to edit permissions is handy. It also displays some additional system apps that Privacy Guard omits.

  • Permissions
    The Permissions app gives you a view of all Android permissions, and shows you which apps have requested a given permission. This is particularly useful to disable the record audio permission for apps that you don't want to suddenly decide to listen to you. (Interestingly, the Record Audio permission disable feature was broken in all Android ROMs I tested, aside from Cyanogenmod 11. You can test this yourself by revoking the permission from the Sound Recorder app, and verifying that it cannot record.)
  • CatLog
  • In addition to being supercute, CatLog is an excellent Android monitoring and debugging tool. It allows you to monitor and record the full set of Android log events, which can be helpful in diagnosing issues with apps.

  • OS Monitor
  • OS Monitor is an excellent Android process and connection monitoring app, that can help you watch for CPU usage and connection attempts by your apps.

  • Intent Intercept
  • Intent Intercept allows you to inspect and extract Android Intent content without allowing it to get forwarded to an actual app. This is useful for monitoring how apps attempt to communicate with eachother, though be aware it only covers one of the mechanisms of inter-app communication in Android.

    Backing up Your Device Without Google

    Now that your device is fully configured and installed, you probably want to know how to back it up without sending all of your private information directly to Google. While the Team Win Recovery Project will back up all of your system settings and apps (even if your device is encrypted), it currently does not back up the contents of your virtualized /sdcard. Remembering to do a couple adb pulls of key directories can save you a lot of heartache should you suffer some kind of data loss or hardware failure (or simply drop your tablet on a bridge while in a rush to catch a train).

    The backup.sh script uses adb to pull your Download and Pictures directories from the /sdcard, as well as pulls the entire TWRP backup directory.

    Before you use that script, you probably want to delete old TWRP backup folders so as to only pull one backup, to reduce pull time. These live in /sdcard/TWRP/BACKUPS/, which is also known as /storage/emulated/0/TWRP/BACKUPS in the File Manager app.

    To use this script over the network without a usb cable, enable both USB Debugging and ADB Over Network in your developer settings. The script does not require you to enable root access from adb, and you should not enable root because it takes quite a while to run a backup, especially if you are using network adb.

    Prior to using network adb, you must edit your Droidwall custom scripts to allow it (by removing the '#' in the #. /data/local/firewall-allow-adb.sh line you entered earlier), and then run the following commands from a non-root Linux shell on your desktop/laptop (the ADB Over Network setting will tell you the IP and port):

    killall adb
    adb connect ip:5555

    VERY IMPORTANT: Don't forget to disable USB Debugging, as well as the Droidwall adb exemption when you are done with the backup!

    Removing the Built-in Microphone

    If you would really like to ensure that your device cannot listen to you even if it is exploited, it turns out it is very straight-forward to remove the built-in microphone in the Nexus 7. There is only one mic on the 2013 model, and it is located just below the volume buttons (the tiny hole).

    To remove it, all you need to do is pop off the the back panel (this can be done with your fingernails, or a tiny screwdriver), and then you can shave the microphone right off that circuit board, and reattach the panel. I have done this to one of my devices, and it was subsequently unable to record audio at all, without otherwise affecting functionality.

    You can still use apps that require a microphone by plugging in headphone headset that contains a mic built in (these cost around $20 and you can get them from nearly any consumer electronics store). I have also tested this, and was still able to make a Linphone call from a device with the built in microphone removed, but with an external headset. Note that the 2012 Nexus 7 does not support these combination microphone+headphone jacks (and it has a secondary microphone as well). You must have the 2013 model.

    The 2013 Nexus 7 Teardown video can give you an idea of what this looks like before you try it. Again you do not need to fully disassemble the device - you only need to remove the back cover.

    Pro-Tip: Before you go too crazy and start ripping out the cameras too, remember that you can cover the cameras with a sticker or tape when not in use. I have found that regular old black electrical tape applies seamlessly, is non-obvious to casual onlookers, and is easy to remove without smudging or gunking up the lenses. Better still, it can be removed and reapplied many times without losing its adhesive.

    Removing the Remnants of the Baseband

    There is one more semi-hardware mod you may want to make, though.

    It turns out that the 2013 Wifi Nexus 7 does actually have a partition that contains a cell network baseband firmware on it, located on the filesystem as the block device /dev/block/platform/msm_sdcc.1/by-name/radio. If you run strings on that block device from the shell, you can see that all manner of CDMA and GSM log messages, comments, and symbols are present in that partition.

    According to ADB logs, Cyanogenmod 11 actually does try to bring up a cell network radio at boot on my Wifi-only Nexus 7, but fails due to it being disabled. There is also a strong economic incentive for Asus and Google to make it extremely difficult to activate the baseband even if the hardware is otherwise identical for manufacturing reasons, since they sell the WiFi-only version for $100 less. If it were easy to re-enable the baseband, HOWTOs would exist (which they do not seem to, at least not yet), and they would cut into their LTE device sales.

    Even so, since we lack public schematics for the Nexus 7 to verify that cell components are actually missing or hardware-disabled, it may be wise to wipe this radio firmware as well, as defense in depth.

    To do this, open the Terminal app, and run:

    cd /dev/block/platform/msm_sdcc.1/by-name
    dd if=/dev/zero of=./radio

    I have wiped that partition while the device was running without any issue, or any additional errors from ADB logs.

    Note that an anonymous commenter also suggested it is possible to disable the baseband of a cell-enabled device using a series of Android service disable commands, and by wiping that radio block device. I have not tested this on a device other than the WiFI-only Nexus 7, though, so proceed with caution. If you try those steps on a cell-enabled device, you should archive a copy of your radio firmware first by doing something like the following from that dev directory that contains the radio firmware block device.

    dd if=./radio of=/sdcard/radio.img

    If anything goes wrong, you can restore that image with:

    dd if=/sdcard/radio.img of=./radio

    Future Work

    In addition to streamlining the contents of this post into a single additional Cyanogenmod installation zip or alternative ROM, the following problems remain unsolved.

    Future Work: Better Usability

    While arguably very secure, this system is obviously nowhere near usable. Here are some potential improvements to the user interface, based on a brainstorming session I had with another interested developer.

    First of all, the AFWall+/Droidwall UI should be changed to be a tri-state: It should allow you to send app traffic over Tor, over your normal internet connection, or block it entirely.

    Next, during app installation from either F-Droid or Google Play (this is an Intent another addon app can actually listen for), the user should be given the chance to decide if they would like that app's traffic to be routed over Tor, use the normal Internet connection, or be blocked entirely from accessing the network. Currently, the Droidwall default for new apps is "no network", which is a great default, but it would be nice to ask users what they would like to do during actual app installation.

    Moreover, users should also be given a chance to edit the app's permissions upon installation as well, should they desire to do so.

    The Google Play situation could also be vastly improved, should Google itself still prove unwilling to improve the situation. Google Play could be wrapped in a launcher app that automatically grants it network access prior to launch, and then disables it upon leaving the window.

    A similar UI could be added to LinPhone. Because the actual voice and video transport for LinPhone does not use Tor, it is possible for an adversary to learn your SIP ID or phone number, and then call you just for the purposes of learning your IP. Because we handle call setup over Tor, we can prevent LinPhone from performing any UDP activity, or divulging your IP to the calling party prior to user approval of the call. Ideally, we would also want to inform the user of the fact that incoming calls can be used to obtain information about them, at least prior to accepting their first call from an unknown party.

    Future Work: Find Hardware with Actual Isolated Basebands

    Related to usability, it would be nice if we could have a serious community effort to audit the baseband isolation properties of existing cell phones, so we all don't have to carry around these ridiculous battery packs and sketch-ass wifi bridges. There is no engineering reason why this prototype could not be just as secure if it were a single piece of hardware. We just need to find the right hardware.

    A random commenter claimed that the Galaxy Nexus might actually have exactly the type of baseband isolation we want, but the comment was from memory, and based on software reverse engineering efforts that were not publicly documented. We need to do better than this.

    Future Work: Bug Bounty Program

    If there is sufficient interest in this prototype, and/or if it gets transformed into a usable addon package or ROM, we may consider running a bug bounty program where we accept donations to a dedicated Bitcoin address, and award the contents of that wallet to anyone who discovers a Tor proxy bypass issue or remote code execution vulnerability in any of the network-enabled apps mentioned in this post (except for the Browser app, which does not receive security updates).

    Future Work: Port Tor Browser to Android

    The Guardian Project is undertaking a port of Tor Browser to Android as part of their OrFox project. This will greatly improve the privacy of your web browsing experience on the Android device over both Firefox and Chrome. We look forward to helping them in any way we can with this effort.

    Future Work: WiFi MAC Address Randomization

    It is actually possible to randomize the WiFi MAC address on the Google Nexus 7. The closed-source root app Mac Spoofer is able to modify the device MAC address using Qualcomm-specific methods in such a way that the entire Android OS becomes convinced that this is your actual MAC.

    However, doing this requires installation of a root-enabled, closed-source application from the Google Play Store, which we believe is extremely unwise on a device you need to be able to trust. Moreover, this app cannot be autorun on boot, and your MAC address will also reset every time you disable the WiFi interface (which is easy to do accidentally). It also supports using only a single, manually entered MAC address.

    Hardware-independent techniques (such as a the Terminal command busybox ifconfig wlan0 hw ether <mac>) appear to interfere with the WiFi management system and prevent it from associating. Moreover, they do not cause the Android system to report the new MAC address, either (visible under Settings -> About Tablet -> Status).

    Obviously, an Open Source F-Droid app that properly resets (and automatically randomizes) the MAC every time the WiFi interface is brought up is badly needed.

    Future Work: Disable Probes for Configured Wifi Networks

    The Android OS currently probes for all of your configured WiFi networks while looking for open wifi to connect to. Configured networks should not be probed for explictly unless activity for their BSSID is seen. The xda-developers forum has a limited fix to change scanning behavior, but users report that it does not disable the active probing behavior for any "hidden" networks that you have configured.

    Future Work: Recovery ROM Password Protection

    An unlocked recovery ROM is a huge vulnerability surface for Android. While disk encryption protects your applications and data, it does not protect many key system binaries and boot programs. With physical access, it is possible to modify these binaries through your recovery ROM.

    The ability to set a password for the Team Win recovery ROM in such a way that a simple "fastboot flash recovery" would overwrite would go a long way to improving device security. At least it would become evident to you if your recovery ROM has been replaced, in this case (due to the absence of the password).

    It may also be possible to restore your bootloader lock as an alternative, but then you lose the ability to make backups of your system using Team Win.

    Future Work: Disk Encryption via TPM or Clever Hacks

    Unfortunately, even disk encryption and a secure recovery firmware is not enough to fully defend against an adversary with an extended period of physical access to your device.

    Cold Boot Attacks are still very much a reality against any form of disk encryption, and the best way to eliminate them is through hardware-assisted secure key storage, such as through a TPM chip on the device itself.

    It may also be possible to mitigate these attacks by placing key material in SRAM memory locations that will be overwritten as part of the ARM boot process. If these physical memory locations are stable (and for ARM systems that use the SoC SRAM to boot, they will be), rebooting the device to extract key material will always end up overwriting it. Similar ARM CPU-based encryption defenses have also been explored in the research literature.

    Future Work: Download and Build Process Integrity

    Beyond the download integrity issues mentioned above, better build security is also deeply needed by all of these projects. A Gitian descriptor that is capable of building Cyanogenmod and arbitrary F-Droid packages in a reproducible fashion is one way to go about achieving this property.

    Future Work: Removing Binary Blobs

    If you read the Cyanogenmod build instructions closely, you can see that it requires extracting the binary blobs from some random phone, and shipping them out. This is the case with most ROMs. In fact, only the Replicant Project seems concerned with this practice, but regrettably they do not support any wifi-only devices. This is rather unfortunate, because no matter what they do with the Android OS on existing cell-enabled devices, they will always be stuck with a closed source, backdoored baseband that has direct access to the microphone, if not the RAM and the entire Android OS.

    Kudos to them for finding one of the backdoors though, at least.

    Changes Since Initial Posting

    1. Updated firewall scripts to fix Droidwall permissions vulnerability.
    2. Updated Applications List to recommend VLC as a free media player.
    3. Mention the Guardian Project's planned Tor Browser port (called OrFox) as Future Work.
    4. Mention disabling configured WiFi network auto-probing as Future Work
    5. Updated the firewall install script (and the android-firewall.zip that contains it) to disable "Captive Portal detection" connections to Google upon WiFi association. These connections are made by the Settings service user, which should normally be blocked unless you are Activating Google Play for the first time.
    6. Updated the Executive Summary section to make it clear that our SIP client can actually also make normal phone calls, too.
    7. Document removing the built-in microphone, for the truly paranoid folk out there.
    8. Document removing the remnants of the baseband, or disabling an existing baseband.
    9. Update SHA256SUM of FDroid.apk for 0.63
    10. Remove multiport usage from firewall-torify-all.sh script (and update android-firewall.zip).
    11. Add pro-tip to the microphone removal section: Don't remove your cameras. Black electrical tape works just fine, and can be removed and reapplied many times without smudges.
    12. Update android-firewall.zip installation and documentation to use /data/local instead of /etc. CM updates will wipe /etc, of course. Woops. If this happened to you while updating to CM-11-M5, download that new android-firewall.zip and run install-firewall.sh again as per the instructions above, and update your Droidwall custom script locations to use /data/local.
    13. Update the Future work section to describe some specific UI improvements.
    14. Update the Future work section to mention that we need to find hardware with actual isolated basebands. Duh. This should have been in there much earlier.
    15. Update the versions for everything
    16. Suggest enabling disk crypto directly from the shell, to avoid SSD leaks of the originally PIN-encrypted device key material.
    17. GMail network access seems to be required for App Store initialization now. Mention this in Google Apps section.
    18. Mention K-9 Mail, APG, and Plumble in the Recommended Apps section.
    19. Update the Firewall instructions to clarify that you need to ensure there are no typos in the scripts, and actually click the Droidwall UI button to enable the Droidwall firewall (otherwise networking will not work at all due to userinit.sh).
    20. Disable NFC in Settings config

    1. Yep, like I said above, that's one of the articles that keep being bandied about repeatedly as 'proof'. You already referenced it earlier, a few times. Thing is, if you actually read the memorandum it's based about, there's actually nothing in it that proves, or even really inferrs, that this surveilance was done by baseband hijack. People looking for conclusions they've already drawn themselves have decided that because the submission stated things like 'can be used anwhere in the US' this means it was a remote activation of the built in microphone. Probably.

    Thing is, as more than a few have pointed out, if you look at it from a more even handed approach, there are plenty of other means that make more sense to provide this outcome.

    2. SIP does indeed have outdialling options, if you're willing to pay for them. But what happens when someone wants (or NEEDS) to call you, and you don't have wifi? The portable wifi hotspots you're talking about, at least where I'm from ,are RUBBISH. Four hours life, tops. Connections drop all the time. They're not a reliable option. You'd spent the rest of your life answering frustrated voicemails....if your SIP provider has voicemail?

    Youre dead right, the GSM network is untrustworthy, unauthenticated, and archaic. But the reality is it's the standard now. Data capabiltiy has added internet to this, but at the end of the day, the ability to give and recieve communication at any time or place is the core reason 99% of people have these things. Even if it's totally secure, a phone that's only a (sortof) phone when you have wifi, and then only if the people you're trying to call have the same sort of phone, is a step backwards.

    I've tried to ask people to switch to non-GSM mesaging in the past and usually got an aswer like "why can't you just use normal text like everyone else?" Trying to convince them to switch with arguments about security is pointless - most people jsut don't give a shit. Even saving money doesn't seem to bother them. They just can't be arsed, and I still have to keep a means of contacting them. So Gibberbot winds up sitting on my phone, unused

    With the setup you're proposing, you are indeed going to probbaly be the most secure phone around at the moment. But it's not much of a phone if it makes talking your mates (and letting them talk to you) a total PITA. And when someone asks you "Hey, what's your number, I'll text you when I can pick you up", any answer you're going to give with this will have to start with "Well, the thing is...." And for 99% of people, that's a dealbreaker.

    1. Right. We don't know exactly what technique is being used in these cases, but we do know that Stingrays and other fake baseband gear exist on the surveillance device market, and they're not cheap, so they must not be useless... The scary bit is that in theory, these devices can also be replicated by a hacker with a GNU radio.

    Your very point here also underscores the problem with basebands: we have *no* verifiability here to really know what they are capable of. They probably can update themselves OTA. In fact, we're pretty sure about that. Beyond that (which is pretty bad, since the network is unauthenticated) all we can do is make guesses. If it were open source, we could verify such behavior was implemented securely. But fat chance of that happening, which is also concerning in and of itself.

    So the only option at the moment remains to isolate it and reduce it to least privilege, which is the traditional computer engineering approach for dealing with such types of systems.

    2. You still seem to be missing the point of this post. It describes a prototype. It is meant to illustrate that it is possible to create a device that has these properties. A mass-market version would not involve some sketch-ass Wifi bridge to the cell network. It would have a simple serial bridge to the cell hardware to route data packets only, and *maybe* a bridge to the microphone that was fully under the control of the OS, for pure voice calls.

    Incidentally, one of the comments above remarked that the Galaxy Nexus may actually have the properties we want already. Now, wouldn't that be nice if we could find out for sure?

    Either way, I wanted to release this version because if it exists and can be made safe for *any* wifi-only device, then we'll have more eyeballs looking at the software side while we search for, wait for, or build a hardware platform that has the isolation properties we want. But even until then, I think there is a sizable niche market even for this hacked up prototype device in terms of hobbyists, privacy enthusiasts, high security users, and/or activist users.

    Moreover as for the performance of the prototype: If your cell provider's service sucks, yes, your experience will suck. I went through 3 el-cheapo carriers before I found one that was reliable. But that is just the nature of cell service. The data networks don't yet have as extensive coverage or reliability as the 2G networks do, but they are getting there. The off-brands are abysmal, and Virgin is also particularly crappy. But, for some providers, the 3G+ data coverage is for all intents and purposes identical to voice (Verizon for sure, and T-Mobile isn't too far off in populated areas).

    1. Yep. Agreed. All I'm saying is that folks seem to be very quick to jump from "They might be able to, we don't know" to "They are". Call me pedantic, but I think there's a big gap there that we shouldn't jump without some sort of solid evidence.

    2. Also agreed! Which is why I was really happy when I found this, after years of google trawling that has previously only turned up only little tidbits scattered all over.

    Even if the basebands might (might) be questionable, it'd still be a mahoosive step forward if the the average user did something as simple as switch to CM, put on Droidwall and use FDE and a half decent screenlock. No, it's not totally secure for a determined adversary. But it sure as shit puts a few stumbling blocks in the way fo the mass data-miners, and mile better than a stock ROM.

    I worry that when some else googles "Secure Andriod" for the first time, and they find this great article, they're going to get to chapter one, read "Wifi Only" and go "Nope, no good for me!", and go back to just using bone stock bloatware ROMs because they've dismissed the concept of a secure setup as impractical.

    There's actually a lot more I'd like to discuss with you Mike, outside of a public comment box (which I already jam too much text into). But I can't seem to find a public email for you....

    Also, just out of curiosity - is the setup you've described here what you actually use day to day?

    It may well be that I'm over-stating the inconvenience of a wi-fi only phone, or that it's only an issue in my corner of the world. But at least for me, it's proven in the past to be nigh on impossible.

    Yes, I do use this setup regularly. The device is my main mechanism of communicating with friends and family. For them, I prefer Tor+OTR+XMPP rather than voice, to be honest, so I suppose I am a bit of a weirdo (it turns out that the privacy of my communications with friends and family is rather important to me -- is that weird? Who knows these days).

    For other communication, I still do have a dirt-cheap flip phone laying around. However, my goal is to fully replace that piece of junk with VoIP out-dialing.

    Again, this is all a huge experiment. I decided to see if I could build the most secure phone in the world more or less because of an argument with a close friend who said it was impossible and insane to try to do this at all. Naturally, I couldn't resist.

    I actually don't know yet if I have convinced them (they are also rather hard to get a hold of, as you might have guessed)... But even if our argument remains unsettled, I am certain that this prototype is a step in the right direction, at the very least.

    Allright, paint me conviced :) I'll give it a crack.

    I don't have a nexus, but I'll see if I can wipe the modem from one of my SGS2s and go from there. Who knows, maybe I can just flash the modem firmware bacdk if I really need GSM for a few minutes, then wipe it again. It's not that hard after all.

    One request - There are those of us who use VPN's instead of Tor for certain things. I know this has security issues of its own, but they are a viable alternative withing their limitiations, just like SIP. Do you think you could add an additional Droidwall script template for VPN users - ie block all outbound wifi traffic except to the VPN servers ( were they'd have to fill in their VPN server IPs) and allow connections on tun0 or whatever the VPN uses?

    The IP thing is not too hard.. Instead of allowing Orbot by UID, change those rule lines into IP address rules instead. However, I am not sure how it will interact with a different virtual interface. It is likely anything I tried to produce for you would not work, so I think my best answer is "Patches welcome! If you get it to work, I will post it in the main doc!"

    It breaks my heart people won't use Tor, of course. But at the end of the day, more people using this type of setup will mean it will get better for everyone, faster. And that's really all I care about.

    Well, this is not going well at all.

    I'm not used to using iptables, and there was a lot of content in those scripts to do with orbot that I cant make sense of.

    I tried adding in this:

    "/system/bin/iptables -A OUTPUT -d [IP address} -j ACCEPT
    /system/bin/iptables -A INPUT -s [IP address} -j ACCEPT"

    This worked with my previous setup, which was bacially a bunch of these rules on top of a default deny in and out rule. But now the open VPN client is just timing out waiting for the server to reply.

    Are you at all able to elaborate on exactly which of the Orbot UID rules that need tweaking for allowing out to other IPs? I do use Tor a lot, but I need connectivity to this VPN as well, and I would think that there' would be a lot of other people who would benefit from a provision to allow connections to a specific address as required.

    Well, in firewall-tor.sh, I replace the INPUT-firewall ORBOT_UID rule line with:

    $IPTABLES -A INPUT-firewall -m conntrack --ctstate ESTABLISHED -m tcp -p tcp -s $TOR_BRIDGE --sport 443 -j RETURN || exit

    I replace the droidwall output ORBOT_UID rule with the following rules:
    $IPTABLES -A droidwall -m owner --uid-owner $ORBOT_UID -o lo -p udp -m multiport --ports 5400 -j RETURN || exit
    $IPTABLES -A droidwall -m owner --uid-owner $ORBOT_UID -o lo -p tcp -m multiport --ports 9040,9050,9051 -j RETURN || exit
    $IPTABLES -A droidwall -m owner --uid-owner $ORBOT_UID -d $TOR_BRIDGE -p tcp --dport 443 -j RETURN || exit
    $IPTABLES -A droidwall -m owner --uid-owner $ORBOT_UID -j droidwall-reject || exit

    The TOR_BRIDGE env var is just a comma separated list of IPs, ie:

    Old comment I know but I'm trying to do this too - would you be able to clarify which Output ORBOT_UID you mean?

    Do we replace

    "$ORBOT_UID -p tcp -j REDIRECT --to-ports 9040 || exit"


    "$IPTABLES -t nat -A OUTPUT -p udp -m owner ! --uid-owner $ORBOT_UID -m udp --dport 53 -j REDIRECT --to-ports 5400 || exit"


    A VPN can be useful for circumventing blocks or maintaining a level of privacy and security on an untrusted network.

    But as a rule, a VPN should not be considered any more private than an ISP.

    The article is basically saying that there is no way to gain access to private information on the phone because only the (closed source) modem/baseband can gain access to the application processor through this particular backdoor/exploit. This means that only Samsung, your cell carrier, or anyone they provide access to, or anyone who can hack into your modem, would be able to access your private data through this backdoor/exploit.

    I'm the guy who originally posted that article after I read it myself. Which you obviously did not, but rather grossly oversimplified to twist it in line with your own preconcoieved conclusions.

    For anyone else reading, what the article ACTUALLY says, in short, is that the firmware "backdoor" that people keep saying was found in some Samsung devices had NO actual evidence that it can be remotely activated, NO evidence it was put there as an intentional exploit vector, and then even if it could be, it can't actually be used to access anything meaningfull on the device unless you've already done so much jiggery-pokery to the host device that trying to exploit a (non) back door is totally redundant.

    Its FUD, and not all suprising, considering that the claims originated from a someone tied to a group trying to promote their own OS over manufacturer ones.


    April 09, 2014


    I don't have a Nexus so I can't run your scripts but I'm trying to create something that can work for me. Using "Network Log", I find an awful lot of connections to Cyanogen Servers and Mountain View servers (probably Google).

    Cyanogen is called nearly every time I install an app while the Mountain View servers are called by nearly every internet application no matter which server is called.

    Cyanogen servers are called by CyanogenMod Account and CM Updater. While the Mountain View servers are called by the system as well as the kernel!

    Does anyone have any documentation on all the connections Android makes as well as what each connection does?


    April 10, 2014


    How come you dont have PDroid on your list of apps to install? Permissions control has got to be one of the most critical things to securing the system.


    April 10, 2014


    Have you look into using Nook HD or Kindle device? the last year model. they very nice tablets and wifi only with no gps and can be find very low $$ everywhere.


    April 10, 2014


    Doesn't CM11 have TextSecure built into it? And doesn't that have some security concerns of its own (sending your contacts list to remote server)?


    April 12, 2014


    this haz totally fucked my phone! I cant undo any of the scripts and nnow i have NO INTERNET unless I use tor which my email blocks. two thumbs down :(


    April 14, 2014


    This is an awesome post -- very many thank you's in your general direction! I'm thinking of buying a Google Nexus 7, or maybe a Nook HD+ if I can't work out how to manage this installation `howto.' Instead of a `Linux laptop,' should one be able to run the root commands of the install/config process with an iOS or another Android tablet, or would a full Unix-based OS like Ubuntu or Mountain Lion probably be necessary?


    April 15, 2014


    I'm having a issue to make Orweb works on this prototype.
    All other apps works fine by Tor, but Orweb don't.

    DuckDuckGo is not a problem, it works fine. But when i change its settings, to use Tor, the same thing happens. It does not works.

    I tried to modify the firewall script, but unsuccessfully.

    Orweb development has been discontinued. Wait for Torbrowser for Android. Or you can use Firefox, but not so secure, especially against fingerprinting.


    April 17, 2014


    The mac spoofing script:


    # Make a backUp of default mac file

    if [ -f "$macfile" ]; then

    if [ ! -f "$macbkp" ]; then
    touch /efs/wifi/.mac.info.bkp
    cat /efs/wifi/.mac.info > /efs/wifi/.mac.info.bkp

    # Uncomment this line for test only. It does not need to run at boot
    # svc wifi disable

    MAC=`echo $RANDOM | md5sum | sed 's/\(..\)/\1:/g' | cut -b-17`
    echo $MAC > /efs/wifi/.mac.info

    # Uncomment these line for test only. It does not need to run at boot
    # svc wifi enable
    # echo $MAC

    It has to put at the end of "userinit.sh" file without the first line "#!/system/bin/sh'. So everytime when the device boot, it get a new mac address.

    It can be used to change the mac address before activating the wireless with device turned on. Just uncomment "svc wifi disable / enable" lines.

    CM11-M4 on the Nexus 7 does not seem to have an /efs/wifi directory. There is an /etc/wifi directory, but it does not have a .mac.info file in it..

    Is this perhaps something specific to the build for your device? Is this property documented anywhere? How did you discover it? The only reference to this file that casual searching uncovered is:

    There are many collisions in the beginning of the md5sum output, so you only get 20708 possible MAC addresses.

    Also, randomizing the first three bytes instead of using a valid OUI makes you stand out as "someone who randomizes his MAC address".


    April 17, 2014


    This mac spoofing script was tested only on a P3110 device running CM11.


    April 17, 2014


    Two thoughts that I had,

    1. It may be a good idea to put in a warning at the encryption stage that the process is very difficult - and in some cases, impossible - to reverse; and on some devices, will not permit recoveries (including TWRP) to mount the /data folder.
    2. Privacy Guard is very useful, but the fact that it does not allow one to block apps from reading phone (and presumably, tablet) status and identity is a pretty big issue. Any app that has that permission will be able to read the unique device ID and, if transmitted (which we paranoid folk have to assume will happen), does a lot to de-anonymize the user. The obvious solution to this is not to use any app that wants this permission or at the very least, to not let it connect to the Internet. But that does limit functionality to some extent. Have you any thoughts as to how this permission may be made more negotiable?

    I have implemented this setup, to the best of my ability, on my phone, and find it to be a vast improvement over my previous setup, which was mostly about praying that Orbot wouldn't crash every time I took a walk. Thank you for making this and I hope that it gets implemented into a simpler ROM package soon.


    April 20, 2014


    Thanks for this excellent post.

    However I got stuck at the install firewall part. Probably due to my inexperience with android. You write "Then, unzip the android-firewall.zip on your laptop, and run the installation script", I've only got a desktop, not laptop, but I guess that's beside the point, anyway why should I run that script on any other device than the Nexus? I also tried the following: did a adb push of the *.sh files to the android device, but then I couldn't find a way to execute them.

    Any advice would be appreciated...


    April 20, 2014


    I thought i read sometihng on hear about a getting the asus google nexus 7 version 2? or a certain model number and it said toget the wifi only version and it said the two model numbers to confirm... anyone know which models numbers would work.....would it be better to get a dual core vs a quad core for privacy.... i read asus cae out with one with dual core and then switch to quad before release.......


    April 22, 2014


    I am looking to try this out. I got a used google nexus 7 is that ok being used?

    I was factory reset is that bad...

    If i wipe it does it contain the info from previous owner?


    April 22, 2014


    Anonymous on April 20th, run './firewall-install.sh' in a shell on your laptop or desktop, with the mobile device attached via usb cable (debugging enabled, and root w/ adb).


    April 23, 2014


    This works with M5 + Nexus 7 (2012).

    On the 2013 edition I am attempting to set up, using M5, Orbot stays at 50%, and the log reads...


    NOTICE: No circuits are opened. Relaxed timeout for circuit 5 (a General-purpose client 1-hop circuit in state doing handshakes with channel state open) to 6000ms. However, it appears the circuit has timed out anyway. 0 guards are live.

    orConnStatus (various nodes): LAUNCHED
    orConnStatus (various nodes): CONNECTED


    I will try M4 and see if that works.


    April 25, 2014


    Mikeperry, I now tried M4 like you did with the 2013 nexus and it also fails.
    In addition, the stock browser fails to connect to the internet (the one for captive portal stuff). Any ideas?


    April 25, 2014


    It takes awhile now, but even if orbot is connected, I'm not able to access the internet.


    April 25, 2014


    Regarding my non-functioning units, I used orbot 3.0.7 for all.

    So 13.0.7 for grouperM5 release, works.

    13.0.7 does *not* work with floM4.


    April 28, 2014


    How can I access the admin interface of the cell modem?

    I've got TPLink cell modem that I use with my Nexus 7 that I've prepared according to these instructions. Now that modem has a web interface for administration at , but I can't seem to find a way to access it from my nexus. I've tried to set it as an excluded node in Orbot, but it didn't make a difference.

    Any thoughts?

    Use the firewall-allow-nontor-browser.sh script (formerly firewall-capportal.sh script) to use the Browser app to bypass Tor and admin your router. You must uncomment it in the Droidwall script UI as the post says. Watch for typos, or it won't work!


    April 28, 2014


    In Settings - Personal - Security - Trusted credentials there are quite a list of certificates. Should all of those really be trusted? Including CNNIC?