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Improvement of Fairness in E-cash Protocol

: Nowadays ecommerce applications are widely used in the world since it is easier than conventional payment system. The various e-cash protocols have been proposed into the literature in order to get better efficiency. This paper analyses the e-cash protocol that was designed to provide non-repudiation and anonymity. The protocol was checked with AVISPA tool and the results show that it meets weak fairness. Therefore, a modified e-cash protocol is proposed in this paper. The proposed protocol also maintains anonymity and non-repudiation. So, this paper presents analysis of the original e-cash protocol and modified protocol by using AVISPA tool.