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Towards a new design of ciphers to secure CPS: the role of control theory

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Abstract

Among several solutions to face the unprecedented increase of attacks towards Cyber Physical Systems, encryption plays a central role. In the form of a Proof of Concept, this contribution gives a new methodology for designing self-synchronizing automata, having in mind their use in symmetric cryptography, namely the Self-Synchronizing Stream Ciphers. The contribution of the paper is to recast the design as control theoretical issues. It calls for a graph-based approach and results borrowed from control theory and dynamical systems, in particular LPV systems. The design leads to not necessarily T -functions as state transition functions of the automata involved in the ciphering and deciphering sides. It is a consideration that is important for the sake of security. Another asset of the approach is that the resulting ciphers admit possibly vectorial inputs to enhance the throughput.
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Dates and versions

hal-03893003 , version 1 (10-12-2022)

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Hamid Boukerrou, Gilles Millérioux, Marine Minier. Towards a new design of ciphers to secure CPS: the role of control theory. 26th International Conference on System Theory, Control and Computing, ICSTCC 2022, Oct 2022, Sinaia, Romania. ⟨10.1109/ICSTCC55426.2022.9931873⟩. ⟨hal-03893003⟩
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