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In distributed systems, the occurrence of an action can give information about the occurrence of other actions. This can be an unwanted situation when &#x201C;high&#x201D; actions of the system need to be kept secret, while allowing users to observe &#x201C;low&#x201D; actions. If it is possible to deduce information about occurrence of high actions by observing only low actions, then the system suffers from an unwanted information flow. &#x201C;Reveals&#x201D; and &#x201C;excludes&#x201D; relations were introduced for modelling and analysing such an information flow among actions of a distributed system that is modelled via Petri nets. In this paper, we provide a formal basis for computing reveals and excludes relations of 1-safe free-choice Petri nets. We introduce the &#x201C;maximal-step computation tree&#x201D; to represent the behaviour of a distributed system under maximal-step semantics. We define a finite prefix of the tree called &#x201C;full prefix&#x201D; and we show that it is adequate for analysing information flow by means of reveals and excludes relations.

A Finite Prefix for Analyzing Information Flow Among Transitions of a Free-Choice Net