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Signal Taps Cloudflare to Help Protect the Privacy of Hundreds of Millions of Users Through Key Transparency

  • Cloudflare has been appointed as an independent Key Transparency auditor for the private messaging app Signal to enhance user confidence in conversation privacy & security.
  • This partnership enables Signal's "automatic key verification" feature to function without requiring users to perform manual off-platform checks of QR codes.
  • Cloudflare periodically pulls updates from Signal's tamper-evident log to cryptographically verify consistency before signing them for user distribution.
  • The auditing process relies solely on cryptographic proofs & does not access user phone numbers, usernames, public keys, or message contents.
  • This collaboration strengthens security for Signal & follows Cloudflare's 2024 announcement as an auditor for WhatsApp, aiming to make independent auditing a standard for encrypted communication.
  • Cloudflare CTO Dane Knecht stated that independent auditing is the logical next step for messaging to ensure encryption is provable rather than just promised.