Per-device keys
Every Apple device registers a keypair. Sender encrypts message N times — once per recipient device. Server only forwards ciphertext.
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Per-device keys
Every Apple device registers a keypair. Sender encrypts message N times — once per recipient device. Server only forwards ciphertext.
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APNs is the transport
Every device holds an APNs long-lived connection. iMessage delivery = special APNs payload. No separate connection needed.