"WhatsApp had used Signal's open-source protocol to encrypt all WhatsApp communications end-to-end by default"
Allegedly*.
Since Whatsapp is proprietary, it can't be proven that OpenWhisper wasn't tampered with on the server. And chances are always against the link that needs the most protection, the user.
FUD "against" proprietary software is pretty much the "reverse racism" of technology.
Again, there is no proof OpenWhisper wasn't tampered with. It'd take WhatsApp becoming Free Software and having independent audits to be reliable as a communications platform. Suspiscion is but a matter of survival, and chances will continue to be usually against the most vulnerable party: the users.
Funny. Discord is the one line I will refuse to cross on yielding my data and metadata. They _are_ downright dangerous. Their CEO's previous project, OpenFeint, already had a privacy scandal lawsuit.
Since WhatsApp is proprietary on both client and server side, it can't be proven that OpenWhisper wasn't tampered with. And chances are always against users when we speak of proprietary.
It's disgraceful that Signal hailed WhatsApp's announcement to use it almost like a second coming of a religious figure.
Allegedly*.
Since Whatsapp is proprietary, it can't be proven that OpenWhisper wasn't tampered with on the server. And chances are always against the link that needs the most protection, the user.