Counter Galois Onion Strengthens Tor Relay Encryption

Tor introduces Counter Galois Onion (CGO) to replace tor1 and harden relay encryption across clients and relays. On 24 November 2025 Tor announces adoption of Counter Galois Onion (CGO) for relay encryption, with implementations underway in Arti (Rust) and C Tor to protect circuit traffic from tagging attacks, add forward secrecy, and modernize authenticators; development […]