A User Efficient Fair Blind Signature Scheme for Untraceable Electronic Cash

摘要

Blind signatures have been widely adopted to construct untraceable electronic cash systems since they are both unlinkable and unforgeable. Although unlinkability protects the privacy of customers and users, it may be abused by criminals for such purposes as to launder money or to safely get a ransom. The techniques of fair blind signatures are developed to deal with the abuse of unlinkability. In this paper we propose a user effi- cient fair blind signature scheme which makes it possible for a government or a judge to recover the link between a signature and the instance of the signing protocol which pro- duces that signature when the unlinkability property is abused.