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Research on Concurrent Signatures and Ring Signatures

Author: ZhangZuoWen
Tutor: WangShangPing
School: Xi'an University of Technology
Course: Applied Mathematics
Keywords: Digital Signature At the same time signature Ring signature Identity - based signature
CLC: TN918.1
Type: Master's thesis
Year: 2008
Downloads: 93
Quote: 1
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Abstract


Fair exchange of digital signatures problem is a fundamental problem in cryptography , and a wide range of applications in e-commerce , at the same time signature is a new tool to solve fair exchange . A signature scheme , the two entities jointly generate two no binding signature until one open an additional information (called \Important information was made public, the two signatures are their real signer binding. The same time signature is a more fair economic exchange digital signatures , it does not require the arbitrator , it is far superior to the previous method , provides a whole new way of thinking for the fair exchange , but the cost can not achieve complete fairness . The signature is also more economical and practical , can be widely used in e-commerce . And the two sides at the same time signature scheme extended to multi-party , to be recognized as a difficult and hot research simultaneously signature . Most of the existing concurrent signature scheme is constructed based on the ring signature , ring signature can be seen as a simplified group signature , it is to protect the anonymity of the signer will not be disclosed , that ring signature can provide need to vagueness . Ring signature group signature in group administrator privileges too big drawback is overcome , the signer is unconditionally completely anonymous , so anonymous e-voting, e-government , e-cash system , key management , key distribution , and multi-party security calculations have a wide range of applications , has become a hot research . This paper focuses on the ring signature and signature multiple parties at the same time signature , and the combination of identity-based signature , made ??mainly work include : ( 1 ) According to the the parties simultaneously signature characteristics , improved multi signature scheme proposed Dongvu Tonien et al based signature combination in, construct a new identity-based multi- signature scheme , which binds the identity and public key , and reduce administrative costs of the program ; ( 2) by Zhang-Kim ring signature scheme analysis of improvements made ??(1 ) identity-based multi signature scheme based on , be modified , and re- construct a new ring signature scheme based on identity and bilinear on the program than the Zhang- Kim the program more efficient .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Confidentiality of communications and communications security > Theory
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