Tor is upgrading its relay encryption algorithm for improved
security. In upcoming releases, Arti and Tor will both support a new
encryption algorithm called Counter Galois Onion (CGO). CGO prevents
attackers from tampering with encrypted traffic, adds forward secrecy,
and brings Tor's encryption up to modern standards.
Tor Browser 15.0 is now available, featuring an update to Firefox ESR 140, improvements to tab management and the address bar on desktop, and screen lock for Android.