高效的基于证书强指定验证者签名方案

针对基于身份公钥密码系统下的强指定验证者签名中的第三方完全可信问题及已有签名方案效率不高的问题,利用基于证书密码系统中证书认证机构(CA)的信任级别低的优点,提出了一个新的强指定验证者签名方案。在随机预言模型下基于双线性Diffie-Hellman(BDH)问题假设给出了形式化的安全性分析。通过性能分析可看出:该方案能满足强指定验证者签名方案的所有性质,且签名长度仅为群中一个元素,具有较高的通信效率,适用于带宽受限的环境。

Efficient certificate-based signature scheme with strong designated verifier

Concerning the flaw that it needs a fully credible third party in ID-based strong designated verifier signature and the low efficiency of existing schemes, taking the advantage of Certificate Authority (CA)'s low trust level in certificate-based public key cryptography, a new strong designated verifier signature scheme was proposed in this paper. Furthermore, the formal security analysis under assumed Bilinear Diffie-Hellman (BDH) problem in the random oracle model was presented. Performance analysis shows the scheme meets all properties of strong designated verifier signature schemes and enjoys higher correspondence efficiency used in bandwidth limited environment since the signature length is just one of the group elements.