无证书限制性部分盲签名方案的分析与改进

Analysis and Improvement of Certificateless Restrictive Partially Blind Signature Scheme

无证书限制性部分盲签名方案不满足限制性,用于电子现金系统时会出现用户重复消费而无法被检测出的情况。为解决该问题,提出一种改进方案,将原方案中签名者的2个部分签名绑定在一起,从而防止在签名阶段伪造出任何形式且无需满足限制性的消息的有效签名。理论分析结果表明,改进方案满足限制性、部分盲性和不可伪造性。

The certificateless restrictive partially blind signature scheme does not satisfy the property of restrictiveness, and an accotmt-holder can not be revealed when double-spending happens. In order to solve this problem, this paper proposes an improved scheme. In the new scheme, the two partial signatures of the signer in the original scheme can be bounded together, thus it can avoid forging valid signatures for any form of messages which does not meet the restrictiveness in the signature stage. Theoretical analysis results show that the improved scheme meets restrictiveness, partial blindness and unforgeability.