WhatsApp vulnerability explained: by the man who discovered it | Tobias Boelter

Facebook denies it is deliberate loophole but Tobias Boelter sets out what the vulnerability is and why it matters

There was an outcry when the Guardian published my information regarding a vulnerability within WhatsApp's implementation of end-to-end encryption, but much of the response misses the point.

Most of the arguments seem to revolve around what is and isn't a backdoor. You can argue that we are looking at a vulnerability which would be something that is there by error, or a backdoor, which would be something that is there deliberately.