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Get Full Access to Discrete Mathematics And Its Applications - 7 Edition - Chapter 4.se - Problem 47e
Get Full Access to Discrete Mathematics And Its Applications - 7 Edition - Chapter 4.se - Problem 47e

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# The encrypted version of a message is LJMKG MGMXF QEXMW.

ISBN: 9780073383095 37

## Solution for problem 47E Chapter 4.SE

Discrete Mathematics and Its Applications | 7th Edition

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Problem 47E

The encrypted version of a message is LJMKG MGMXF QEXMW. If it was encrypted using the affine cipher f (p) = (7p + 10) mod 26, what was the original message?Autokev ciphers are ciphers where the n th letter of the plaintext is shifted by the numerical equivalent of the nth letter of a keystream. The keystream begins with a seed letter; its subsequent letters are constructed using either the plaintext or the ciphertext. When the plaintext is used, each character of the keystream, after the first, is the previous letter of the plaintext. When the ciphertext is used, each subsequent character of the keystream, after the first, is the previous letter of the ciphertext computed so far. In both cases, plaintext letters are encrypted by shifting each character by the numerical equivalent of the corresponding keystream letter.

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