Study On Id-based Signature Scheme Without Trusted Center

Identity-based cryptography was first proposed by Shamir in the 1984 , and itis not a traditional public key certificate management system of the existing problemscaused by Many scholars. Then some scholars discovered the identity-based cryptogra-phy existence of key escrow issues, Al-Riyami and Paterson in the ASIACAYPT2003proposed Certificateless of cryptography to solve the problem of key escrow.Combinethe traditional identity-based cryptography with Certificateless of cryptography, Wepropose a Identity-based signature scheme without trusted center on the basis of Liaoand others'work, and then, we studied the identity-based aggregate signature without atrusted and the proxy signatures without a trusted.In this dissertation, we study the construction of the Identity-based signaturescheme without trusted center. The results obtained are outlined as followed:(1) We proposed an identity-based signature scheme without trusted center, the pro-gram is based on bilinear pairings, and its operation does not require the signaturestage, only stage in the pre-signature have an operation ,in the pre-validation phasehave an operation, and in the stage of verify have an operation, so its e?ciency isthe highest of its kind signature scheme.(2) Based on the proposed identity-based signature scheme without trusted center , weconstructed an identity-based aggregate signature without trusted center and anidentity-based proxy signature scheme without trusted center. The new programsmeet the security and e?cient.