[–] wunderlust 0 points 1 point 1 point (+1|-0) ago
To add to /user/Zaimoxis' comment: WhatsApp uses Open Whisper System's products on Android. (iOS was in the works, anyone knows what's-(a)p with that? Also, group messages are not encrypted even on Android. Source
[–] heyitsfred 0 points 1 point 1 point (+1|-0) ago
OWS has a Snowden endorsement on their site, which isn't bad at all, verified, he namedropped them in particular in an interview. Not to say that Whatsapp is 100% trustworthy, but it at least has end to end encryption when used with Android phones, which is better than the majority of popular chat systems, excluding iMessage.
[–] wunderlust ago
Good point! It's one thing to contract OWS and quite another to use the full-range of their services, given that their parent company may be actively obligated to not do so, don't you think? CryptoCat looks good for iOS, albeit browser based.