Certificateless Linkable Ring Signature Scheme Based on SM2 Digital Signature

In order to solve the problems of malicious users abusing anonymity and key escrow existing in the existing identity-based ring signature schemes, a certificateless linkable ring signature scheme based on SM2 digital signature is proposed. This scheme generates user private keys based on the certificateless public key cryptosystem, and can protect user private keys from being leaked even when the key generation center is attacked. In the signature stage, the signature is generated by combining the SM2 digital signature algorithm, which improves the signature speed. Through the linkable signature algorithm, the verifier can link multiple signatures generated by the same signer, effectively preventing malicious users from abusing anonymity. In terms of security proof, this scheme has anonymity, unforgeability and tag linkability. By comparing with other schemes, this scheme uses tag linkability to solve the problem of malicious users abusing anonymity and key escrow.