The Research And Applications Of Blind Signature

Blind signature is a kind of digital signature used in e-cash technology in e-commerce. "Blind" means when the user require a signature of some information, they just want to gain legal signature, without let the signer know the content of the information or something related. In the last 20 years, many researchers have done a lot of work on it, but considering the construction of blind signature scheme and its protocol in specific implementation, there are still some problems to be studied.We give two efficient blind signature in our paper, 1 :An optimal blind signature with message recovery. We uses an ideal cipher with a smaller block size to design a secure two-move blind signature, put the message redundancy into the real message could shorter the length of the information transmission. Our blind scheme has the message recovery property with less bandwidth. This blind signature can be implemented with a truly real block cipher. Besides this, To ensure the availability and performance of the algorithm, we also give the scheme for longer message in our paper.2: A blind signature with no random oracles. Boneh and Boyen gave a new encryption in a paper, our blind signature scheme is derived from their idea. We first give a blind signature without random oracles, with this property, the blind signature scheme is secure in standard model. Then, use Common Reference String to do non-interactive zero knowledge proof, we make the blind signature into only two moves to achieve round optimal, and the concurrency operation of blind signature can be reach by this.Consider the security of blind signature: blindness and unforgeability, we provide the detail analysis. We also compare our blind signature scheme with the similar algorithm. To point out, these two schemes have their own advantage and appropriate conditions of implement way, we will describe it in the paper.In recent years, besides e-cash, blind signatures were used in e-voting, electronic auctions and more fields of digital information. Its research direction is how to construct an efficient scheme and make it safe, as well as how to use it in the real application. In our paper, we also make the proposed blind signature scheme to be used in e-cash as an example.