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Feistel block cipher. Assume a simple two-round Feistel block ci- pher 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 deci- mal numbers (also from 0 to 255). The key derivation is defined as K; = K+ 75 * i (mod 256), where 1 < i < 2. The Feistel function is f(K;, R;-1) = 127 * (K; + R;–1) (mod 256) where R;-1 is the deci- mal representation of the right 8 bits of the input block. Encrypt the message (200, 33) with the key 10.

Feistel block cipher. Assume a simple two-round Feistel block ci- pher 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 deci- mal numbers (also from 0 to 255). The key derivation is defined as K; = K+ 75 * i (mod 256), where 1 < i < 2. The Feistel function is f(K;, R;-1) = 127 * (K; + R;–1) (mod 256) where R;-1 is the deci- mal representation of the right 8 bits of the input block. Encrypt the message (200, 33) with the key 10.

Computer Networking: A Top-Down Approach (7th Edition)
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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Network Security and Cryptography 1. Feistel block cipher. Assume a simple two-round Feistel block ci- pher 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 deci- mal numbers (also from 0 to 255). The key derivation is defined as K; = K + 75 * i (mod 256), where 1 < i < 2. The Feistel function is f(Ki, R;-1) = 127 * (K; + R;1) (mod 256) where R;-1 is the deci- mal representation of the right 8 bits of the input block. Encrypt the message (200, 33) with the key 10.
Transcribed Image Text:Network Security and Cryptography 1. Feistel block cipher. Assume a simple two-round Feistel block ci- pher 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 deci- mal numbers (also from 0 to 255). The key derivation is defined as K; = K + 75 * i (mod 256), where 1 < i < 2. The Feistel function is f(Ki, R;-1) = 127 * (K; + R;1) (mod 256) where R;-1 is the deci- mal representation of the right 8 bits of the input block. Encrypt the message (200, 33) with the key 10.
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