This procedure produces a product cipher.

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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5. 1
Given two ciphers, plaintext may be enciphered by using one of the ciphers,
and by then using the other cipher. This procedure produces a product cipher.
(a) Find the prduct cipher obtained by using the transformation y = 11x + 18
followed by the transformation y = 5x + 3 mod 26.
mod 26
(b) Find the prduct cipher obtained by using the transformation y = ax + b mod 26
followed by the transformation y = cx+d mod 26 with gcd(a, 26) = gcd (c, 26) =
1.
Transcribed Image Text:5. 1 Given two ciphers, plaintext may be enciphered by using one of the ciphers, and by then using the other cipher. This procedure produces a product cipher. (a) Find the prduct cipher obtained by using the transformation y = 11x + 18 followed by the transformation y = 5x + 3 mod 26. mod 26 (b) Find the prduct cipher obtained by using the transformation y = ax + b mod 26 followed by the transformation y = cx+d mod 26 with gcd(a, 26) = gcd (c, 26) = 1.
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