Complete Threshold Proxy Signature And Threshold Proxy Blind Signature Scheme Research

As an important technology in the information age, the digital signature can replace the traditional signature to satisfy the ability of resistance to denial, forgery, tampered with, and pretend to be, etc, in the signature. So digital signatures are used widely in some special industries, such as banking and finance system, electronic commerce and trade, and network reservation system. In the actual work and life, someone can entrust his signing authority trusted agent to represent his exercise of power when he cannot enforce the undersigned signature due to some unavoidable reasons. In order to meet the actual needs of different occasions, all kinds of proxy signatures, like proxy signature with message recovery, proxy signature without the certificate, the threshold proxy signature and proxy blind signature, are born. And threshold proxy signature can deal with concentrated power of proxy signature better.This article mainly researches full threshold proxy signature and threshold proxy blind signature scheme. Firstly, combining with the threshold idea and the bilinear pairings, a full threshold proxy signature scheme is proposed based on the certificate-less signature scheme of Yu-Chi Chen.The new scheme not only has the advantages of certificate-less password system, but also has the merits of threshold proxy scheme which can distalsoibute the proxy digital signature power and storage the proxy key dispersedly, and it can be used in broader range of practical application fields. Secondly, based on the same idea, a threshold proxy blind signature scheme is designed in this paper, and the paper also analyses the blindness and strong unforgeability of the new scheme.