Signal adds an extra layer of security to make sure you're actually chatting with the right person

Signal has introduced a new layer of security to help make sure no one has secretly interfered with your encrypted chats. The chat app is favored by diplomats, activists, and journalists for its security. It uses end-to-end message encryption and “safety numbers” – cryptographic fingerprints associated with the keys securing a conversation – which users can compare to verify they have the expected encrypted connection with a contact. But in theory, someone could still intercept messages by corrupting the centralized directory of accounts and posing as somebody else – a classic "man in the middle" attack. Everything would still be encrypted, just going to the wrong place. To fight this possibility, Signal announced a new feature...

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