Research On Proxy Blind Signature Schemes And Application

With the development of science and technology, computers are widely used in every field of our society. This promotes the Internet technology, which is also convenient to people's life and work. However, it is not secure enough in internet.Because of technique factors and attacks, the information can be deleted, replayed and tampered during its conveying, which causes much trouble. So the digital signature was produced. As an effective technique it has the property of integrity, authentication and nonrepudiaton. It can also encrypt information. Now it has been wildly applied in every field of the internet.Now common digital signature schemes can not be sufficient for the demand of the people. So many digital special signature schemes have been proposed to be applied in some special field. Chaum etc proposed a blind signature scheme in 1993. The signer can know nothing of the signed information during signing information. So the signed information can be protected. Mambo etc proposed a proxy signature scheme in 1983.A designated signer called proxy signer could sign the information instead of the original signer. So a valid signature can be produced when the original signer is absent. Tan etc proposed a proxy blind signature scheme, this scheme has the characteristic of the proxy signature scheme and the blind signature scheme. So it can be applied in the field of e-cash and e-vote.The writer has made some progress in proxy blind signature and its application. The paper firstly introduces some basic conceptions of digital signature, proxy signature, proxy blind signature and give some typical proxy signature schemes, blind signature schemes, proxy blind signature schemes. The writer analyzes the existing proxy blind signature schemes. The writer points out the insecurity of the existing proxy blind signature schemes. Then the writer proposed a new proxy blind signature scheme based on the existing proxy blind signature. The security of the new scheme is also discussed and shown that it have good properties as unlinkability. An adversary can't republish the proxy public key and claim that he is the original signer, It can transfer information through a insecure channel, the original signer can't forge the blind signature of the proxy signer. It is proved that the new scheme is more secure and useful. Secondly, the paper introduce the knowledge of e-cash and as an instance, an applying of the new scheme in e-cash is described. The new proxy proxy blind signature is very useful in real life.