Provable Secure Multi-Authority Attribute-Based Signature without a Central Authority
Wenping Ma · Dianzi Ke-ji Daxue xuebao · 2012
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.