In an affine cipher, if k = (a, b) = (3, 7), then what is the encryption of x=9. Answer by typing just theresulting number in the box.

Answered: In an affine cipher, if k = (a, b) =…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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In an affine cipher, if k = (a, b) = (3, 7), then what is the encryption of x=9. Answer by typing just the
resulting number in the box.

Expert Solution

Step 1

An affine cipher, (like a shift cipher), is an example of a substitution cipher: In encryption using a substitution
cipher, each time a given letter occurs in the plaintext, it always is replaced by the same ciphertext letter.
For example, the plaintext letter ‘e’ might be replaced by the ciphertext letter ‘K’ each time it occurs. The
method used for this replacement in affine encryption can be viewed as a generalization of the method used
for encryption using a shift cipher.

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