News for hackers. Stuff that matters.
Re:Brazilian doctors use WhatsApp to talk to patients by gareim on Tuesday December 08, 2015 @12:25PM (#10697835)
I think this might be relevant. Especially the last paragraph.

http://www.blog.twosense-labs.com/whatsapp-renegs-on-their-p...

Re:Brazilian doctors use WhatsApp to talk to patients by JumpCrisscross on Tuesday December 08, 2015 @04:51PM (#10699842)
> In interviews with journalists WhatsApp stated that they would use Public Key Encryption, where only the sender and recipient can unencrypted content. Indeed they did, but they used the same key for every user.

Wow.