Answer
$p=7* (c -13) mod 26$
Work Step by Step
Encryption function is -
c = 15p + 13 mod 26.
15 * 7 = 105 = 1 mod 26.
So the decryption function is
p=7* (c -13) mod 26
Discrete Mathematics and Its Applications, Seventh Edition
by Rosen, Kenneth
Published by
McGraw-Hill Education
ISBN 10:
0073383090
ISBN 13:
978-0-07338-309-5
Chapter 4 - Section 4.6 - Cryptography - Supplementary Exercises - Page 307: 11
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