Formal Analysis of Mobile Payment Protocol KSL Based on SSM

The mobile e-commerce protocols often have more complex structures than authentication protocols. Strand space model (SSM) is an intutive, highly efficient formal analysis method. In this paper, the strand space model is described and expanded, and the confidentiality, authentication and fairness of KSL protocol are analyzed by strand space formal methods. The analysis shows KSL is unfair and an improvement is given. By analyzed again, the improved KSL is valid.