Collaborative blind signature method and system based on SM2 algorithm

According to the collaborative blind signature method and system based on the SM2 algorithm provided by the embodiment of the invention, in the generation process of the collaborative key pair, the initiator indirectly introduces the component of the collaborative private key by introducing the collaborative public key P1 into the public key PA of the collaborative key pair, so that the security of the private key is ensured. In the collaborative signature process, P1 is introduced when a fourth elliptic curve point Q2 is calculated, so that a complete k corresponding to the Q2 cannot be obtained, and a message digest e and a first part signature r are hidden by designing an intermediate signature r, so that a first message M is ensured not to be known by a collaborative party in message content, and the collaborative party cannot track the signature. 本发明实施例提供一种基于SM2算法的协同盲签名方法及系统，在协同密钥对生成过程中，发起方通过在协同密钥对的公钥PA中引入协作方公钥P1的方式间接引入协作方私钥的成分，保证了私钥的安全性。在协作签名过程中，在计算第四椭圆曲线点Q2时引入P1使得无法获取Q2对应的完整k，且通过设计中间签名r´的方式隐藏了消息摘要e和第一部