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Tor Implements Counter Galois Onion Encryption for Enhanced Security

Tor Implements Counter Galois Onion Encryption for Enhanced Security

First seen 25 Nov 2025, 18:29 UTC • •

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ThreatCluster AI
ThreatCluster •March 12, 2026 at 13:27 UTC

Tor has transitioned to a new encryption algorithm called Counter Galois Onion (CGO) to improve the security of its circuit traffic. This change aims to bolster defenses against modern traffic-interception attacks, thereby enhancing user anonymity on the Tor network. The new algorithm replaces the older tor1 relay encryption and is expected to support future cryptographic advancements.

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