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See Chinese contents: GM/T 0044.4-2016 GM/T 0044.4-2016: Identity-based cryptographic algorithms SM9 - Part 4: Key encapsulation mechanism and public key encryption alogorithm
This Part of GM/T 0044 specifies the identity-based key encapsulation mechanism and public key encryption algorithm implemented using elliptic curve pairing and provides the corresponding flows. Key encapsulation mechanism can be used to encapsulate the key to a specific entity. Public key encryption and decryption algorithms are identity-based asymmetric cryptographic algorithm, which enables the sender of a message to encrypt the message using the identity of the receiver, and only the receiver can decrypt the ciphertext with the corresponding private key to get the message.
