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Special Proxy Signature Research And Applications

Posted on:2012-05-13Degree:MasterType:Thesis
Country:ChinaCandidate:L H PengFull Text:PDF
GTID:2208330335971821Subject:Applied Mathematics
Abstract/Summary:PDF Full Text Request
With the fast development of computer network and its information technology, digital signature plays an important role in the information security%the key distribution,electronic systems,military affairs and information systems.Proxy signature that is a special digital signature is obtained as result of the delivery of the signature's right, that is to say, the original signer to sign for his authority to his agent instead of himself to exercise the signature to verify who believe that the valid proxy signature is the result of the original signed consent and authorization. The signature is legitimate. According to a variety of different needs, people propose a lot of proxy signature schemes, such as proxy signature with proxy revocation, forward secure proxy signature, proxy blind signature and so on.This paper mainly discusses some special kinds of proxy signature schemes, and designs a more safe and efficient proxy signature scheme to solve some security problems existing in schemes by learned knowledge. Also, we apply the proxy blind signature scheme to the electronic cash system. The main contents are as follows:1. Based on bilinear pairing, a new safe and efficient proxy signature scheme is proposed. The new scheme can efficiently resist the strong forgery attack and satisfy the security of strong proxy signature. Compared with other schemes, the new scheme has better security and efficiency. Using embedded time stamp, a new proxy signature with proxy revocation is proposed. Moreover, the new proxy signature scheme efficiently solves the difficult problem of proxy revocation.2. Through the security analysis of Niu Jiang-pin et al.'forward secure proxy signature (called NZ scheme) and Xia Xiang-sheng et al.' forward secure proxy signature (called XHG scheme), we have found that the schemes have security omissions. A new forward secure proxy signature based on RSA signature scheme is proposed. The new scheme not only can satisfy all securities of proxy signature, but also has the properties of forward security. This greatly reduces the damage to the system causing by exposed key.3. Combined with blind signature with proxy signature, we present a proxy blind signature based on certificateless public key cryptography. The new scheme enjoys the blindness properties and untraceability, and solves the problems of certificate management and key escrow in proxy signature schemes, and improves its security and efficiency.4. Applying the certificateless proxy blind signature into the electronic cash scheme, we have proposed a new electronic cash scheme. Analytic result shows that this electronic cash scheme has some characteristics, such as unforgeability, anonymity, unlink ability, no double-spending and so on. At the same time, the scheme has good application value.
Keywords/Search Tags:proxy signature, forward secure proxy signature, proxy blind signature, certificateless proxy signature, electronic cash
PDF Full Text Request
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