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The authors investigate the effect of certain active attacks on the secrecy capacity of wiretap channels by considering arbitrarily varying wiretap channels. They establish a lower bound for the secrecy capacity with randomized coding of a class of such channels and an upper bound for that of all such channels. They show that if the arbitrarily varying wiretap channel possesses a bad "Averaged" state, namely one in which the legitimate receiver is degraded with respect to the eavesdropper, then secure communication is not possible.
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