Proposing a New Approach for Security of Sending e-Cash Based on Blind Signature and Asymmetric Encryption Algorithms

In e-Cash, signer must sign a value without seeing it's content directly. Traditional RSA based approaches encounter a fundamental problem named Chosen Text Attack. The main aim of this research is to propose an approach to overcome such attack. Although using random values in signature apparently raise computational complexity, it guaranties security. In this paper, computational complexity of the proposed approach has been studied and its superiority compared to the regular blind signature approach of Fan et al. has been approved. Resistance against forgery, which is the main objective of the new signature approach has also been studied and approved.