http://keybase5btp2qikoau6u326pvotn47gb55mo6fjxxyxdoywiinomr5id.onion/blog/chat-apps-softer-than-tofu
Eve simply makes it look to Alice that Bob bought a new phone: Bob (Eve) : Hey Hey Alice : Yo Bob! Looks like you got new safety numbers. Bob (Eve) : Yeah, I got the iPhone XS, nice phone, I'm really happy with it. Let's exchange safety numbers at RWC 2020.