Abstract. Since several years, ClearSy has driven large projects about using formal proofs at system level in the railway domain. The fundamental goal in these projects is to extract the rigorous reasoning establishing that the considered system ensures its requested properties, and to assert that this reasoning is correct and fully expressed. In this paper, we give feedback about the methodology used in all these projects, about the differences made by whether the concerned system is currently under design or already existing and about the benefits obtained. The formal proofs are performed using Event-B, with the Atelier-B toolkit.
Abstract. This document describes an industrial application of the B method in smart card applications. In smart card memory, data modification may be interrupted due to a card withdrawal or a power loss, the EEPROM memory may result in an unstable state and the values subsequently read, may be erroneous. The transaction mechanism provides a secure means for modifying data located in the EEPROM. As the security in smart card application is paramount, the use of the B formal method brings high confidence and provides mathematical proofs that the design of the transaction mechanism fulfills the security requirements
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