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In this paper, a new wiretap channel model is proposed, where the legitimatetransmitter and receiver communicate over a discrete memoryless channel. Thewiretapper has perfect access to a fixed-length subset of the transmittedcodeword symbols of her choosing. Additionally, she observes the remainder ofthe transmitted symbols through a discrete memoryless channel. This new modelsubsumes the classical wiretap channel and wiretap channel II with noisy mainchannel as its special cases. The strong secrecy capacity of the proposedchannel model is identified. Achievability is established by solving a dualsecret key agreement problem in the source model, and converting the solutionto the original channel model using probability distribution approximationarguments. In the dual problem, a source encoder and decoder, who observerandom sequences independent and identically distributed according to the inputand output distributions of the legitimate channel in the original problem,communicate a confidential key over a public error-free channel using a singleforward transmission, in the presence of a compound wiretapping source who hasperfect access to the public discussion. The security of the key is guaranteedfor the exponentially many possibilities of the subset chosen at wiretapper byderiving a lemma which provides a doubly-exponential convergence rate for theprobability that, for a fixed choice of the subset, the key is uniform andindependent from the public discussion and the wiretapping source'sobservation. The converse is derived by using Sanov's theorem to upper boundthe secrecy capacity of the new wiretap channel model by the secrecy capacitywhen the tapped subset is randomly chosen by nature.

A New Wiretap Channel Model and its Strong Secrecy Capacity