[cookiengineer]

The issue I have with that statement is that it cannot be proven. There is no source code of whatsapp, so this could have been changed anytime.

I mean, it's certainly possible to have an administrative backdoor that just shares the local keys. Even when that wasn't the case when you worked there, and even if we believe that you say the truth: we still cannot be certain that this won't change on February 8th.

I mean, whatsapp was remotely exploitable for more than 5 years before it was discovered (just to make a point).

[cranekam]

Yes, of course this can't be proven. I'm reasonably confident what I stated still holds but I can't be certain. If that's enough of a turn off for you then your best bet is to not use the service.