Abstract
Many virtual payment systems are available on the world wide web for micropayment, and as they deal with money, correctness is important. One such payment system is Netpay. This paper examines the server-side version of the Netpay protocol and provides its formalization as a CSP model. The PAT model checker is used to prove three properties essential for correctness: impossibility of double spending, validity of an ecoin during the execution and the absence of deadlock. We prove that the protocol is executing according to its description based on the assumption that the customers and vendors are cooperative. This is a very strong assumption for system built to prevent abuse, but further analysis suggests that without it the protocol does no longer guarantee all correctness properties.
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Chaudhary, K., Fehnker, A. (2015). Model Checking a Server-Side Micro Payment Protocol. In: Núñez, M., Güdemann, M. (eds) Formal Methods for Industrial Critical Systems. FMICS 2015. Lecture Notes in Computer Science(), vol 9128. Springer, Cham. https://doi.org/10.1007/978-3-319-19458-5_7
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DOI: https://doi.org/10.1007/978-3-319-19458-5_7
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