Facebook Messenger has started rolling out Secret Conversations, a feature that enables end to end encryption for conversations within Messenger. Secret Conversations is built on Signal Protocol, a modern, open source, strong encryption protocol we developed for asynchronous messaging systems.
Signal Protocol powers our own private messaging app, Signal. The protocol is designed from the ground up to make seamless end-to-end encrypted messaging possible and to make private communication simple. To amplify the impact and scope of private communication, we also collaborate with other popular messaging apps like WhatsApp, Google Allo, and now Facebook Messenger to help integrate Signal Protocol into those products.
These are all good steps forward, trail-blazed by – at least among the big companies – Apple.