摘要
设计了无需中心授权机构的多授权签名方案,将用户的多个属性由不同的授权机构分别管理。与往常的多授权机构密码体制不同,不需要一个可信的中心授权机构来管理和约束多个授权机构,而是可信授权机构的数量达到一定值就能保证整个系统的安全性,提高了系统的实用性。采用归约的可安全证明方法证明该方案的安全性归约为计算Diffie-Hellman难题、分布式密钥生成协议(DKG)和联合的零秘密共享协议(JZSS)的安全性,从而说明该方案有存在性、不可伪造和抗合谋攻击的安全特性。
In attribute-based cryptosystem, many attributes of a user were monitored by a single authority, which would inevitably increase its workload and reduce its efficiency. In this paper, a multi-authority signature scheme without a central authority is proposed. In this scheme, many attributes of a user are monitored by many different authorities respectively, in stead of a trusted central authority. The scheme increases the system＇s applicability. The security of this scheme is proved equal to computational Diffie-Hellman （CDH） problem. So the scheme has two characteristics of existential unforgeability and security preventing collusion attack.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
2012年第4期552-556,共5页
Journal of University of Electronic Science and Technology of China
基金
国家自然科学基金(61072140)
高等学校创新引智计划(B08038)
