Conception et simulation des générateurs, crypto-systèmes et fonctions de hachage basés chaos performants

Abstract : In this thesis, we study the problem of chaos based information security and its services namely: the confidentiality, the data integrity and the source authentication. Firstly, the generation of efficient chaotic sequences problem is treated. Thus, we propose three efficient generators, each one including a perturbation technique to overcome the inconveniences of the finite precision. The first generator uses a coupling of non linear Boolean functions. The second generator is based on a flexible and effective layer of global diffusion. The third generator uses the parallel coupling of two non linear recursive filters. Then, the question of the design and the implementation of a strong and fast chaos based crypto-systems is studied and analyzed. Concerning this issue, we propose, two dynamic chaos based crypto-systems of structure SPN, very efficient compared with the AES algorithm. The second crypto-system contains with regard to the first one, a layer of effective diffusion, but does not require operations of decimal towards binary and binary towards decimal conversions. The quantification of the performances is achieved, at every layer and globally, using adequate tools. Both cryptosystems are suitable for software and hardware implementations. Finally, a new efficient chaos based hash function, with or without key is proposed. It allows effectively the services of the data integrity and the source authentication.
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Hassan Noura. Conception et simulation des générateurs, crypto-systèmes et fonctions de hachage basés chaos performants. Electronique. UNIVERSITE DE NANTES, 2012. Français. ⟨NNT : ED503-166⟩. ⟨tel-01104996⟩

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