L’écriture du corps dans Les cent vingt journées de Sodome de Sade

Algorithmes de calcul de logarithmes discrets dans les corps finis

Computing discrete logarithms is a fundamental task for public key cryptanalysis. Themere existence of a subexponential algorithm for this purpose is not sufficient to definitely ruleon the security level provided by some cryptosystem. Assessing state-of-the-art cryptanalysiscalls for a thorough evaluation process. This dissertation contributes to such an evaluation.In particula...

Approximation diophantienne dans les corps de séries en plusieurs variables

— We prove a theorem of diophantine approximation between the field of formal power series in several variables and its completion for the Krull topology.

Définissabilité dans les Corps de Fonctions p-Adiques

We study function fields over p-adically closed fields in the first-order language of fields. Using ideas of Duret [D], we show that the field of constants is definable, and that the genus is an elementary property. ?0. Introduction. Soit p un nombre premier fixed. Un corps p-adiquement clos est un corps elementairement equivalent au corps des nombres p-adiques, Qp. Le langage des corps sera le...

Contribution à l'étude de quelques parasites du sang du mouton et de la chèvre en Iran et dans les pays voisins

Sécurisation du Contrôle d'Accès dans les Bases de Données

Smartcards are themost secure portable computingdevice today.They have been used successfully in applicationsinvolving money, and proprietary and personal data (such asbanking, healthcare, insurance, etc.). As smartcards get morepowerful (with 32-bit CPU and more than 1MB of stablememory in the next versions) and become multi-application,the need for database management ...