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Apple Announces 'Groundbreaking' New Security Protocol for iMessage (www.macrumors.com)

submitted 8 months ago by [email protected] to c/[email protected]

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Apple Announces 'Groundbreaking' New Security Protocol for iMessage::Apple today announced a new post-quantum cryptographic protocol for iMessage called PQ3. Apple says this "groundbreaking" and...

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[–] [email protected] 32 points 8 months ago

the symmetric ratchet, protects older messages in a conversation to achieve forward secrecy. For every message, we derive a per-message encryption key from the current session key. The current session key itself is then further derived into a new session key, ratcheting the state forward. Each message key is deleted as soon as a corresponding message is decrypted, which prevents older harvested ciphertexts from being decrypted by an adversary who is able to compromise the device at a later time, and provides protection against replayed messages. This process uses 256-bit keys and intermediate values, and HKDF-SHA384 as a derivation function, which provides protection against both classical and quantum computers.

https://security.apple.com/blog/imessage-pq3/