Does this say something about the unicity distance

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Reference no: EM132178548

(From Wikipedia)

In cryptography, unicity distance is the length of an original ciphertext needed to break the cipher by reducing the number of possible spurious keys to zero in a brute force attack.

That is, after trying every possible key, there should be just one decipherment that makes sense, i.e. expected amount of ciphertext needed to determine the key completely, assuming the underlying message has redundancy.

Critique this definition for a ciphertext-only attack on a shift cipher.

In particular, considering the ciphertext ALIIP and its possible plaintexts, does this say something about the unicity distance?

Textbooks claim that the unicity distance of a shift cipher is about 1.3. Can you reconcile this with your last answer?

Reference no: EM132178548

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