Both you and the other person in the secret conversation have device keys that you can use to verify that the messages are end-to-end encrypted. You can see your device keys on any device where you're using secret conversations. Each of your devices will have its own device keys.
How do you unlock a secret conversation on Messenger?
- Open the Messenger app and tap on your profile icon in the upper-left-hand corner.
- Scroll down and select Secret conversations.
- Slide the button to the right.
How do I read an encrypted secret conversation on Messenger?
Tap the i icon in the top right-hand corner of the message thread, and on the next screen tap Secret Conversation. The screen will turn to a black theme again, and you're good to go. To view an open secret conversation thread just choose it from the list of open message threads on the main screen of the app.2016-10-05