Answered: Assume a simple two-round Feistel block…

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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Feistel block cipher.

Assume a simple two-round Feistel block cipher
with an 8 bit key and a 16 bit block size. We write the key
as a decimal number (from 0 to 255) and the input as two decimal
numbers (also from 0 to 255). The key derivation is defined as
Ki = K + 75 ∗ i (mod 256), where 1 ≤ i ≤ 2. The Feistel function
is f(Ki,Ri−1) = 127 ∗ (Ki + Ri−1) (mod 256) where Ri−1 is the decimal
representation of the right 8 bits of the input block. Encrypt the
message (200, 33) with the key 10.

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