Structuring and Visualising an IC-card Security Standard

The standard way of visualising protocols using pictures with boxes and arrows is insufficient to study the protocols in detail. The problem is that the structuring of the protocols relies on elements not explicit in the usual visual rendering. To solve the problem one should visualise not only the operations and the messages but also the state and the security. This paper presents a system which can be used to visualise a protocol, and is applied to some of the protocols in the load purse transaction of the CEN Inter-sector electronic purse draft standard as an example. The resulting conformant prototype provides abstract and concrete views on the system at all significant levels. The prototype supports animation of the standard, giving the protocol designer feedback on design decisions.