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See Chinese contents: GM/T 0044.3-2016 GM/T 0044.3-2016: Identity-based cryptographic algorithms SM9 - Part 3: Key exchange protocol
This Part of GM/T 0044 specifies the identity-based key exchange protocol implemented using elliptic curve pairing and provides the corresponding flow. This protocol enables both communication parties to obtain a shared secret key jointly decided by both parties by calculation through the identity of the other party and its own private key and through two or alternatively three information transmission processes. This secret key may be used as the session key for the symmetric cryptographic algorithm. Options in the protocol enable key confirmation.
