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Conference Papers Year : 2022

strategFTO: Untimed control for timed opacity


We introduce a prototype tool strategFTO addressing the verification of a security property in critical software. We consider a recent definition of timed opacity where an attacker aims to deduce some secret while having access only to the total execution time. The system, here modeled by timed automata, is deemed opaque if for any execution time, there are either no corresponding runs, or both public and private corresponding runs. We focus on the untimed control problem: exhibiting a controller, i.e., a set of allowed actions, such that the system restricted to those actions is fully timed-opaque. We first show that this problem is not more complex than the full timed opacity problem, and then we propose an algorithm, implemented and evaluated in practice.

Dates and versions

hal-03874435 , version 1 (28-11-2022)



Étienne André, Shapagat Bolat, Engel Lefaucheux, Dylan Marinho. strategFTO: Untimed control for timed opacity. 8th International Workshop on Formal Techniques for Safety-Critical Systems (FTSCS 2022), Cyrille Artho; Peter Ölveczky, Dec 2022, Auckland, New Zealand. pp.27-33, ⟨10.1145/3563822.3568013⟩. ⟨hal-03874435⟩
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