Two-Stage Optimal Hypotheses Testing for a Model of Stegosystem with an Active Adversary

Two-Stage Optimal Hypotheses Testing for a Model of Stegosystem with an Active Adversary

Blog Article

We study the information-theoretic model of stegosystem with an Baking Dishes active adversary, where unlike a passive adversary he can not only read but also write.The legitimate sender as well as the adversary can embed or not a message in the sending data.The receiver’s first task is to decide whether the communication is a covertext, data with no hidden message, or a stegotext, modified data with a hidden secret message.

In case of stegotext, the receiver’s second task is to decide whether the message was sent by a legitimate sender or from an adversary.For this purpose an authenticated encryption from the legitimate sender is Kettle considered.In this paper we suggest two-stage statistical hypothesis testing approach from the receivers point of view.

We propose the logarithmically asymptotically optimal testing for this model.As a result the functional dependence of reliabilities of the first and second kind of errors in both stages is constructed.A comparison of overall error probabilities with the situation of one stage hypotheses testing is discussed and the behaviour of functional dependences of reliabilities are illustrated.