可追溯的广义指定验证者签名证明方案

Traceable Universal Designated Verifier Signature Proof Scheme

为了解决传统广义指定验证者签名证明方案中强隐私保护性质对验证者不公平的问题,提出了可追溯的广义指定验证者签名证明(traceable universal designated verifier signature proof,TUDVSP)方案.在TUDVSP方案中,引入一个追溯中心,可将指定者的转换签名恢复为原始签名,从而防止签名者与指定者合谋欺骗验证者.基于现实应用考虑,从不可伪造性、抗仿冒攻击和可追溯性这3个方面定义了TUDVSP方案的安全模型.利用双线性映射构造具体的TUDVSP方案,并证明该方案具有不可伪造性、抗仿冒攻击和可追溯性.实验结果表明,完成一次签名追溯仅需21 ms左右的计算开销与120字节的通信开销.

To solve the problem of unfairness for verifier in the traditional universal designated verifier signature proof scheme because of the strong privacy-preserving property,the notion of traceable universal designated verifier signature proof(TUDVSP)was proposed.In this new kind of conditional privacy-preserving authentication scheme,a tracing center was introduced which can recover the transformed signature to the original one,and thus avoid the signer collude the delegator to cheat the verifier.Based on the consideration of real-word applications,security model which contains unforgeability,security against impersonation attack,and traceability for TUDVSP scheme was proposed.By using bilinear map,a concrete TUDVSP scheme was proposed,and the unforgeability,security against impersonation attack,and traceability of the proposed scheme were also proved.The experimental results indicate that it only takes about 21 ms of computation cost and 120 byte of communication overhead.