Titre :	Chaos synchronization using non-linear observers with applications to cryptography
Type de document :	document électronique
Auteurs :	Mohamed Camil Belhadjoudja, Auteur ; Mohamed Tadjine, Directeur de thèse ; Messaoud Chakir, Directeur de thèse
Editeur :	[S.l.] : [s.n.]
Année de publication :	2021
Importance :	112 f., 1 fichier PDF (6,8 Mo)
Présentation :	ill.
Note générale :	Mode d'accès : accès au texte intégral par intranet. Mémoire de Projet de Fin d’Études : Automatique : Alger, École Nationale Polytechnique : 2021 Bibliogr. f. 108 - 112
Langues :	Anglais (eng)
Mots-clés :	Chaos theory Cryptography Nonlinear observers Chaos synchronization Lattices
Index. décimale :	PA01721
Résumé :	The subject of this thesis is the synchronization of chaotic systems using non-linear bservers, with applications to cryptography. I present in my thesis a general method to improve the performance of some observers with unknown inputs. I also develop a method to improve the frequency characteristics of chaotic systems such as the Rossler system and the Lorenz system. I also build modifications of a twisting observer for systems with time delay. Among these modifications, there is a method that allows us to consider any unknown input of a system in triangular form as being a fictitious state, which allows us to use state observers for the estimation of an unknown input. I construct also the notion of higher-adaptive-order sliding mode observers. I also present a countermeasure using ANFIS observers and an improved Lorenz system facing an acoustic cryptanalysis attack against RSA, then I combine the chaos theory with the lattice theory to generate new problems in post-quantum cryptography

Chaos synchronization using non-linear observers with applications to cryptography [document électronique] / Mohamed Camil Belhadjoudja, Auteur ; Mohamed Tadjine, Directeur de thèse ; Messaoud Chakir, Directeur de thèse . - [S.l.] : [s.n.], 2021 . - 112 f., 1 fichier PDF (6,8 Mo) : ill.
Mode d'accès : accès au texte intégral par intranet.
Mémoire de Projet de Fin d’Études : Automatique : Alger, École Nationale Polytechnique : 2021
Bibliogr. f. 108 - 112
Langues : Anglais (eng)

Mots-clés :	Chaos theory Cryptography Nonlinear observers Chaos synchronization Lattices
Index. décimale :	PA01721
Résumé :	The subject of this thesis is the synchronization of chaotic systems using non-linear bservers, with applications to cryptography. I present in my thesis a general method to improve the performance of some observers with unknown inputs. I also develop a method to improve the frequency characteristics of chaotic systems such as the Rossler system and the Lorenz system. I also build modifications of a twisting observer for systems with time delay. Among these modifications, there is a method that allows us to consider any unknown input of a system in triangular form as being a fictitious state, which allows us to use state observers for the estimation of an unknown input. I construct also the notion of higher-adaptive-order sliding mode observers. I also present a countermeasure using ANFIS observers and an improved Lorenz system facing an acoustic cryptanalysis attack against RSA, then I combine the chaos theory with the lattice theory to generate new problems in post-quantum cryptography