前向安全的指定接收者恢复消息的部分盲签名方案

在指定接收者恢复消息签名方案的基础上加入了前向安全性,提出一种新的部分盲签名方案.新方案能够减少通信量,避免因密钥的泄露而导致以前的所有签名无效,只有指定的接收者才能恢复原始消息,进一步加强了消息的隐秘性.新方案中签名发起人和签名者合作完成签名,签名密钥按周期更新,在签名过程中加入了最终可恢复消息的接收者的信息.安全性分析表明新方案满足部分盲性、前向安全性和不可伪造性等安全性要求.

A partially blind signature scheme of forward secure designated receiver with message recovery

Based on designated receiver signature scheme with message recovery,a new partially blind signature scheme is proposed with forward security property.In the new scheme,the communication cost is lower and it can avoid all the signatures become invalid because of the signature keys of signers are leaked.Moreover,only the designated receiver can recover the original message and can strength the security of the message.In the scheme the signature sponsor and the singer cooperate to sign,and the signature key is updated in every period,the information of receiver’s who can recover the message is inserted in the signature process.An analysis of the security of the proposed scheme shows that it satisfies the partial blindness,forward security,unforgeability and so on.