Modeling and Model Checking Mobile Phone Payment Systems

Recently a technique for transacting goods using GSM mobile phones has become very popular. We present a formal model of these novel transactions using a views based modeling technique. We show how to express two safety properties namely goods and money atomicity within this model using a sub-logic of CTL. By automatically generating a labelled transition system from our views model we can model check these properties. We show how to generalise this model to arbitrary numbers of processes. Goods atomicity fails under certain circumstances thus exposing some deficiencies that exist in existing implementations.