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This document discusses exploiting silence zones in digitized speech that has been encrypted using a stream cipher to perform ciphertext-only cryptanalysis. It presents techniques to distinguish between ciphertext corresponding to random speech zones and non-random silence zones using linear complexity profile analysis. For single channel communication, it shows how to convert the ciphertext-only attack to a known plaintext attack by using the fixed encoding of silence zones to deduce the keystream and decr

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