Earlier quoted context omitted.
That guardian article was pretty bad. It scared a lot of people from WhatsApp (which is still in general mode secure than most options) to text messaging by claiming that this was somehow some huge security flaw. From WhatsApp’s point of view this was a reasonable ux trade off. It is a major pain point of signal when it does this (particularly in group chats where it is more likely to happen). But I agree that from a…
Sorry, but his is a major security flaw. WhatApp, their mothership Facebook, or any party who can coerce them into doing so (e.g. the US government), can use this to rekey targets with their own keys, virtually undetectable by most regular users, thereby completely MITMing the message exchanges. Even moxie, who created this stuff, more or less admitted this[0], by saying the rekeying notification is the only defense,…
Personally I can not imagine Human Rights Activist having the Rekeying Notification set OFF.