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The Research On Identity-Based Digital Signature Scheme Without Trusted Private Key Generator

Posted on:2007-01-28Degree:MasterType:Thesis
Country:ChinaCandidate:D F SuFull Text:PDF
GTID:2178360185965296Subject:Computer application technology
Abstract/Summary:PDF Full Text Request
Recently, digital signature scheme's private key management is simplified because of introducing identity-based digital signature. It permit the user selects conveniently public key, and the private key generator generates private key based the information that the user submit. So, the private key generator can forge user's valid signature, and user cannot provide a valid proof to judge that the private key generator is treachery, and the user must trust unconditional the private key generator. List as follows:Firstly, this paper proposes a novel identity-based signature scheme without trusted private key generator. In this scheme, users must participate the process of generating the secret key pairings, and users need not to trust unconditionally private key generator so that the user may provide a proof to judge that the private key generator whether or not has treachery. This scheme verify signature from bilinear pairing on supersingular elliptic curves or hyperelliptic curves, improve the efficiency of verification signature. At the same time, users can add some special information to public key, so that the scheme gets more secure and practical. Furthermore, we prove that the scheme can against existential forgery on adaptively chosen message attack.Secondly, this paper proposes an identity-based group signature scheme without trusted group manager based computation Diffie Hellman problem. This scheme generate group member certificate based group manager's private key and the private information group member submit and this scheme can against exculpability and coalition-resistance attack, supposed there is only one Private Key Generator. The length of the group public key and the signature is independent on the number of the group members in this scheme. This scheme verify group signature from bilinear pairing, reduce the timings of verification signature, and prove that reversion of computation Diffie-Hellman problem is equilvalent to computation Diffie-Hellman problem under random oracle model.
Keywords/Search Tags:digital signature, identity-based, bilinear pairings, private key generator, group manager, electronic cash system
PDF Full Text Request
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