可转换指定证实人部分盲签名  

Convertible designated confirmer partially blind signatures

作　　者：黄振杰[1] 郝艳华[1] 王育民[1] 

机构地区：[1]西安电子科技大学综合业务网国家重点实验室

出　　处：《西安电子科技大学学报》2004年第5期757-760,769,共5页Journal of Xidian University

基　　金：国家自然科学基金资助项目(19931010);国家973项目(G1999035804)

摘　　要：将部分盲签名的概念扩展成可转换指定证实人部分盲签名,给出其正式定义和一个具体的方案.在可转换指定证实人部分盲签名中,只有用户指定的证实人和用户自己才能验证和向他人证实签名的有效性,而且他们还能也只有他们才能将签名转换为通常的部分盲签名.所提出的方案是安全和高效的,其不可伪造性与Schnorr方案相同,其不可传递性基于Diffie Hellman问题.该方案还可当作盲签名方案或一般部分盲签名方案使用.The concept of partially blind signature is extended to the convertible designated confirmer partially blind signature, which has an additional property that only the designated confirmer and the user can verify and prove the validity of given signatures and convert given signatures into universally verifiable partially blind signatures. A formal definition is given and a practical scheme is proposed. The proposed scheme is efficient and secure, in which its unforgeability is the same as that of the Schnorr's signature scheme and its untransferability relies on the hardness of the Decision-Diffie-Hellman Problem. Furthermore, the proposed scheme can be used as a normal partially blind signature scheme by letting the designated confirmer's secret key be a common constant.

关 键 词：密码学 数字签名 部分盲签名 指定证实人 

分 类 号：TN918.2[电子电信—通信与信息系统]