Multi-party collaborative encryption and decryption method and device based on SM2 algorithm, system and medium

Abstract

The invention relates to the technical field of data encryption and decryption, in particular to a multi-party collaborative encryption and decryption method and device based on an SM2 algorithm, a system and a medium. The method comprises the following steps: S1, group members register to a trusted center to form a group; S2, the group members and the trusted center respectively generate privatekey components, the trusted center sequentially performs polling communication with the group members to generate a common public key based on a security computing protocol of an SM2 algorithm, and the public key is used for a message sender to perform data encryption; and S3, the trusted center receives the encrypted data, carries out polling communication with the group members in sequence, andcarries out cooperative decryption on the encrypted data by adopting a private key component based on an SM2 algorithm and the group members to obtain decrypted data. In the encryption and decryptionprocess, each group member in the group needs to participate in the effective decryption, the fair participation of each group member is ensured, and through the registration verification of the trusted center, the fake name replacement of participants is effectively avoided, and the sharing of decrypted information among the group members is ensured.

Description

technical field [0001] The present invention relates to the technical field of data encryption and decryption, and more specifically, relates to a multi-party cooperative encryption and decryption method, device, system, and medium based on the SM2 algorithm. Background technique [0002] With the development of cryptography and computing technology, the commonly used 1024-bit RSA algorithm is facing serious security threats. The State Cryptography Administration released the SM2 elliptic curve public key cryptography algorithm on December 17, 2010. Compared with the RSA algorithm, SM2 has more advantages in terms of security and performance. [0003] In the public key cryptosystem, ensuring the security of the private key is a very important issue. The user's private key usually needs to be safely stored and used in a special hardware security module (HSM, Hardware Security Module), and the private key cannot be derived from the cryptographic hardware. Common HSMs includ...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a multi-party cooperative encryption and decryption method based on the SM2 algorithm, a device, a system, and a medium to solve the problem of low security of data encryption and decryption between multiple participants in the prior art

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