GoKawiilDeepMind AI tool formally verifies key cryptographic guarantees in Signal protocol
Google DeepMind researchers used an agentic AI system called AlphaProof Code to mathematically prove several cryptographic guarantees underlying the Signal protocol, which secures messaging on Signal, Google Messages and WhatsApp. The four-week project found no new vulnerabilities but covered only part of the protocol, not the full Signal mobile app.
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The result offers additional independent assurance that widely used encrypted messaging systems behave as intended, since formal verification mathematically checks software logic rather than relying on testing alone. DeepMind scientist Swarat Chaudhuri says the team wants to eventually scale this approach to verify much larger amounts of software, suggesting AI-assisted proof techniques could reshape how security guarantees are established industry-wide, though it remains unclear how feasible that scaling will be.
- DeepMind's AlphaProof Code formally verified parts of the Signal protocol's cryptographic guarantees in four weeks.
- No new vulnerabilities were found, but the analysis did not cover the entire Signal mobile app.
- Researchers describe the project as an early milestone toward using AI to scale formal verification across more software.
Source: wired.com — Lily Hay Newman, 2026-11-10
Published there as: “A New AI Tool From Google DeepMind Proved the Signal Protocol Is Secure”
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