Google DeepMind just achieved a massive cybersecurity milestone. Swarat Chaudhuri, a research scientist at the company, shared on X that their team cracked a major software challenge.

They used a new AI framework called AlphaProof Code to formally verify the Signal cryptographic protocol down to the machine-code level. This is the same encryption that protects your private texts on WhatsApp and Google Messages.This means that researchers have mathematically proven that the underlying code does exactly what it promises without any errors.

It is a huge relief for the billions of users whose daily communications are protected by this technology.How the Google AI did the impossibleIn the past, mathematically proving that software code was perfectly secure took decades of expert human effort. AI has changed the game completely.

Over four weeks in October 2026, AlphaProof Code agents generated more than six million lines of mathematical Lean proof.Powered by the latest Gemini Carbon models, the AI agents did the heavy lifting. They worked alongside human experts and audited the proof to highlight areas that needed a second look.

In the end, humans only had to review just one per cent of the codebase, which is a massive time saving. To prove the AI actually worked, researchers tested it by putting two previously fixed bugs back into the Signal code.

The AI system successfully caught both of them.What this means for your daily chatsMost cyberattacks happen because of simple code bugs that humans miss. By using AI to catch these errors, developers can fix them before hackers exploit them.

Chaudhuri stated that this is just the first step and that their ultimate goal is to verify the software infrastructure of the whole world to eliminate these preventable bugs.DeepMind has released all of its specifications and proofs online for the open-source community to inspect and build upon. While verifying all the software in the world is still a long way off, this marks a massive first step towards a future where critical infrastructure, from your daily WhatsApp chats to medical devices and power grids, can be made completely hack-proof.- Ends