The Research Of The Transcendence Of The Number And Threshold Signature And Designated Verifier Signature Scheme | Posted on:2012-11-04 | Degree:Master | Type:Thesis | Country:China | Candidate:Q F He | Full Text:PDF | GTID:2178330335478398 | Subject:Applied Mathematics | Abstract/Summary: | PDF Full Text Request | In this dissertation, we mainly study the lower bound for the linear form in the limits of sequences of rationals and some Designated Verifier Signature Schemes and the forward-secure threshold signature scheme. The main achievements are as follows:1,The linear form in the limits of sequences of rational numbers with algebraic numbers yields was studied, and the estimate of the lower bound was given.2,This paper analyzed the security of many Designated Verifier Signature Schemes and point out they were insecure and hand not the characteristic of unforgeability at all. Because that the auther forged an effective signature can be verified by the verifier.3,By the ideas of ID-based and proxy signature scheme and strong designated verifier signature scheme, a new ID-based strong designated verifier proxy signature scheme is proposed. This scheme not only has the advantages of strong prescriptive, but also has good safety.4,This paper proposes a new scheme of identity-based threshold proxy blind signature based on bilinear mapping theory.This scheme not only solves the problem of anonymity by the blind signature but also solves the problem of excessive concertration of power while addressing the agency.The safety analysis finds that the program is easy to implement.and is safe.can be applied in practice.5,In this paper, the security of a forward-secure threshold signature scheme is analyzed. It points out that it can be forged, and not forward. At the end, this paper proposed a new scheme based on ELGamal forward-secure system. | Keywords/Search Tags: | sequences of rationals, limit, linear form, lower bound, Designated Verifier, threshold signature, proxy signature, blind signature, forward-secure | PDF Full Text Request | Related items |
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