Shannon's estimate for unicity distance (the length of ciphertext needed to deter mine a key when the plaintext is an English message) is H(K) R, where R is the per character redundancy in English What is the unicity distance for the Vigenre cipher with equiprobable keys of length (You may assume ...

Shannons estimate for unicity distance in the Vigenre cipher can be ca ...

Shannon's estimate for unicity distance (the length of ciphertext needed to deter- mine a key when...

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Discrete Mathematics and Its Applications

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