DeepMind's AlphaProof Code formally verifies Signal protocol, an industry first
jedisct1 · x · 2026-11-10
Google DeepMind introduced AlphaProof Code, a multi-LLM agentic framework for deep formal verification, and hit a long-standing grand challenge: AI agents mathematically proved key security properties of the actual code behind the Signal protocol — the first time any method, with or without AI, has formally verified the implementation of a widely deployed cryptographic protocol.
- Signal protects billions of private conversations in apps like Signal and Google Messages.
- Workflow mirrors a research team: human experts + models translated Signal's security goals into formal specs (each reviewed by humans), then Gemini Carbon-powered agents produced the proofs — over six million lines of Lean.
- Formal verification is the highest standard of security assurance but is typically labor-intensive; the framework combines human expertise with AI agents to scale it.
- Technical paper released alongside the announcement.
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