Proxy Blind Signature Scheme And Improvements

Network communication promote and accelerate the social information's development. But in internet environment,information security is not optimistic.Information transmission process may be deleted, tampered and replayed which caused a lot of trouble with our life and work.In this case, the digital signature is produced.With digital signature technology in-depth and practical application, ordinary 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 1983; Mambo etc proposed a proxy signature scheme in 1993; In 2002, Tan Zuowen etc proposed a proxy blind signature scheme. As the same time,with the continuous development and research of digital signatures, the proxy blind signature can be applied to electronic cash, electronic voting and other applications,which also has high practical value.On the paper,the writer has made some progress in the proxy blind signature and its application.The paper firstly introduces some basic conceptions of math-ematic,proxy signature, blind signature, proxy blind signature and some conceptions, the writer analyzes the existing proxy blind signature schemes.The writer points out the insecurity of the existing proxy blind signature schemes.For example,linkability, abuse of the proxy signer. With the security problem, the new proxy blind signature overcome the some security flaws of existing proxy blind signature scheme.So the new proxy blind signature scheme is more safe and useful.Secondly, the paper introduces the knowledge of electronic cash, and as an instance, the new scheme applies in electronic cash,which proposes a new electronic cash scheme.It is pointed out the new proxy blind signature has a good practical application.