The Research And Improving Of Proxy Signature

This paper is mainly focused on the project in aspect of proxy signature. Proxy signature is a special class of digital signatures which allows an original signer to delegate his signature capability or signature right to a designated person who is called a proxy signer to sign on specified documents on behalf of the original signer. The primary difference between proxy signature and digital signature is that there is an intermediate component, which is called proxy signer between original signer and signature receiver, is added in proxy signature.In real world, proxy signature is an ordinary familiar practical activity. We studied the traditional proxy signature, and the following is our main creative research works:(1)We analysis two typical proxy signature schemes, which have important significance for the development of this study field, show attack scenarios against these schemes.(2)A proxy signature scheme was proposed to protect original signer's privacy. In delegation authorization, the original signer encrypts the message and other delegating parameters to the proxy signer. The scheme ensures that the proxy signer and others except the valid receiver can not get any information from the message. In special application, the original signer wants to conceal the identity of the corresponding proxy signer in the proxy signature. The receiver can not recognize the identity of the proxy signer from the proxy signature. In the case of a later dispute, the original signer can reveal the real identity of the proxy signer with the help of the original signer from the proxy signature. In the paper, a new proxy signature scheme should satisfy this requirement.(3)We presented two forgery attacks on a proxy multi-signature scheme based on elliptic curves discrete logarithm problem proposed by Ji and Li. Furthermore, they presented a new modified and secure scheme to prevent the two forgery attacks. In this paper, a more secure and compact proxy multi-signature scheme which without the participant of third party has been proposed.(4)In this paper, we have the excellences of bilinear projection of weil-pairing and zero-knowledge proof. On the basis of elliptic curve signature, we presents a new proxy...