Google Uses Artificial Intelligence to Verify Security of Signal's Encryption Software

2026, November 10

United States

Google DeepMind announced a major development in artificial intelligence and cybersecurity after using its new AlphaProof Code system to mathematically verify important security properties of the software underlying the Signal messaging protocol. The technology, powered by AI agents, generated more than six million lines of formal mathematical proofs to examine the implementation of Signal's encryption system, which protects billions of private communications.

According to Google, the verification process took approximately four weeks, compared with potentially years of work using traditional research methods. Researchers also deliberately reintroduced two previously corrected software vulnerabilities, and the system successfully identified their security implications. The breakthrough could eventually help developers verify the security of banking systems, medical devices and critical infrastructure.