You can't prove that something is secure, because to be applicable in mathematics/computer science there has to exist a precise definition. If someone is just

You can't prove that something is secure, because to be applicable in mathematics/computer science there has to exist a precise definition. If someone is just saying "This is a formally verified protocol" without what they actually checked for, they are salespeople not mathematicians. "The authors of the KRA paper were able to understand what the proofs were about, and why they don’t cover the KRACK vulnerability. Even though the original proofs didn’t reveal security flaws, a principled approach would use these proofs in order to discover where to look." https://galois.com/blog/2017/10/formal-methods-krack-vulnerability/ https://galois.com/blog/2017/10/formal-methods-krack-vulnera...