Analysis And Improvement Of Special Proxy Signature

Based on the research actuality about proxy signature, this paper gives analysis and modification towards some special proxy signature. Some signature schemes have some limitations because they need security channel to transmit cipher key. We could conduct anonymous signature in order to providing privacy protection for the proxy signers. Some signature schemes have long signature length and large computation cost result in low efficiency. Towards these problems, this paper conducts some research and designes several secure and effective proxy signature schemes.Main contributions of this paper are summarized as follows:1,Based on discrete logrithm problem, a new multi-proxy blind signature scheme is proposed using multi-proxy signature and blind signature. The proposed scheme doesn't request security channel to transmit proxy cipher key and has properities of unforgeability and unlinkability.2,The requirement of proxy signer's privacy protection is needful in some proxy signature schemes. Based on bilinear pairing, an anonymous proxy blind aggregate signature scheme is proposed. The proposed scheme provides privacy protection for proxy signers and blinds the message and has traceability.3,Considering computation cost, a strong designated verifier signature and a strong designated verifier multi-proxy signature based on identity are proposed. Comparing with Kumar's and Susilo's and Kang's schemes, the proposed strong designated verifier signature is lower in signature cost and verification cost. The proposed strong designated verifier multi-proxy signature could scatter signing authority of proxy signers.