Abstract. In this paper we study a model of hypotheses testing consisting of with to simple homogeneous stationary Markov chains ith finite number of states such that having different distributions from four possible transmission probabilities.For solving this problem we apply the method of type and large deviation techniques (LTD). The case of two objects having different distributions from to given probability distribution as examined by Ahlswedeh and Haroutunian.Résumé. Dans cet article nousétudions un modèle de tests d'hypothèses composé de deux chaines de Markov stationnaires homogènes et simples avec un nombre fini d'états ayant différentes distributions parmi quatre probabilités de transition possibles. Pour résoudre ce problème, nous appliquons la méthode des types et des techniques de grandes deviations. Le cas de deux objets ayant différentes distributions issues d'une distribution de probabilité donnée, aété examiné par Ahlswedeh et Haroutunian.
In this paper, we introduce an information-theoretic model for Hidden message (steganography) with a passive adversary. We define a security notion that is based on hypothesis testing.The security of a steganographic system is quantified in terms of the relative entropy between P C and P S .
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