SM2-based multi-receiver public key encryption method

Abstract

The invention discloses a SM2-based multi-receiver public key encryption method. A traditional multi-receiver public key encryption method depends on a traditional public key encryption method, and has the defects of low encryption efficiency and high communication bandwidth requirement. Aiming at the defects, the invention provides the SM2-based multi-receiver public key encryption method for random number reuse, so that the method has the advantages of high encryption efficiency and low communication bandwidth requirement. A sender may encrypt a message into a ciphertext by using the method,and broadcasts the ciphertext to a plurality of receivers in a network; after receiving the ciphertext, the receivers can decrypt the ciphertext through a private key to obtain the message of the sender. According to the method, formalization proves that the safety of the RR-IND-CCA can be achieved, the calculated amount of the sender can be effectively reduced, and the actual work application requirements in the aspects of safety and efficiency are met.

Description

technical field

[0001] The invention relates to the technical field of information security, in particular to an SM2-based multi-recipient public key encryption method. Background technique

[0002] The multi-recipient public key encryption method was first proposed by Bellare and Boldyreva et al. in the document "Public-key encryption in a multi-user setting: Security proofs and improvements". The method is extended to multiple receivers, that is, the same message is encrypted n times with n different public keys to obtain the broadcast ciphertext, and the receiver decrypts it with its own private key to obtain the message. However, in the case of multiple receivers, the sender needs to reselect the random number every time it encrypts, which requires a huge amount of calculation and reduces the overall efficiency.

[0003] Subsequently, Bellare and Boldyreva et al. proposed the concept of "reproducible PKE" in the document "Multirecipient encryption schemes: How to save o...

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