Event Based Formalization of Communication Properties for an E-Commerce Protocol: An Event-B Approach

Abstract

The objective of this paper aims at modeling and analysis of communication properties of an E-commerce protocol with the Event-B language. NetBill protocol is developed for selling and buying of information and goods through the Internet. In this approach, we have used Event-B as proof-based development method which integrates proof techniques for writing specifications and building the model systematically using refinement, the key point is to start with a very abstract model of the system under development. Step by step details are added to this first model by building a series of more concrete ones. This strategy eases the proof of the correctness of requirements because only a small number of proof obligations are generated at each step. The aims are constructing a model with a clear and accurate formulation of the communication protocol properties and discharge of all proof obligations. The outcome of this procedure was that we achieved a very high degree of automatic proof. We reached a good degree of automatic proof. All interactive proofs involved a small number of steps and were straightforward to reach.