Maurice Tutor

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    Argosy University/ Phoniex University/
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    Phoniex University
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Category > Computer Science Posted 23 Sep 2017 My Price 5.00

Caesar cipher

A generalization of the Caesar cipher, known as the affine Caesar cipher, has the following form: For each plaintext letter , substitute the cipher text letter :

C = E([a, b], p) = (ap+ b) mod 26

A basic requirement of any encryption algorithm is that it be one-to-one. That is, if p ≠ q  , then E(k, p) Z E(k, q). Otherwise, decryption is impossible, because more than one plaintext character maps into the same cipher text character. The affine Caesar cipher is not one-to-one for all valuesof. For example, for a = 2b = 3 and ,then E([a, b], E([a, b], 0) = ], 13) = 3 .

a. Are there any limitations on the value of? Explain why or why not.

b. Determine which values of are not allowed.

c. Provide a general statement of which values of are and are not allowed. Justify your statement.

Answers

Maurice Tutor
(5)
Status NEW Posted 23 Sep 2017 09:09 AM My Price 5.00

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