End-to-end encryption has become an increasingly important feature for messaging platforms as people become more and more concerned about security. Now, Facebook Messenger is jumping in on the trend with a new feature called “secret conversations”. It won’t be enabled by default, however. The feature will be opt-in and for now it’s available only to a small number of users for testing, with a wider rollout promised for later this summer or in early fall.
Messenger’s encryption will be based on Open Whisper System’s Signal Protocol — the same well-known and well-tested encryption that Facebook-owned WhatsApp uses.