[mysticmarvel]

This exploit is not in the original Signal protocol, and was introduced by WhatsApp. Signal discards undelivered messages when the encryption key changes, WhatsApp implemented re-transmission because they think it improves usability. It does do that, and it also introduces this security risk.

It says so right in the article. Stop spreading FUD.

[antihero]

Moxie endorsed Whatsapp, though. We view Moxie as a trusted actor, so either he is untrustworthy which would SUCK or he didn't know that they did this.