Google DeepMind AI proves Signal protocol secure

google deepmind researchers used agentic ai to formally verify key cryptographic guarantees of the signal protocol, a widely used encryption protocol. the analysis, conducted in just four weeks, did not find any new vulnerabilities in the portions of the signal protocol it looked at. the researchers used a new ai framework called alphaproof code, which can significantly cut down the time required for formal verification. the work demonstrates google deepmind's formal verification capabilities and has implications for software security, particularly for critical services used in high-stakes settings. however, it is unclear whether ai-automated formal verification can truly scale and do so at a workable cost.