Answered: Task: If key = 20 is used, encrypt the…

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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Question

(Computer Networks)

Note the plaintext and ciphertext in monoalphabetic - additive cipher images below:

In the images, each character is both lowercase (plaintext) and uppercase characters (ciphertext) is given the integer value mod26 (not ASCII). Encryption algorithm used is add the plaintext value with the key used. While The decryption algorithm used is subtract the ciphertext value from the key used. All values are expressed in integer mod26 (0-25).

Task:

If key = 20 is used, encrypt the plaintext of a name: MIYA
If key = 20 is used, decrypt the ciphertext of a word: MIYAMI
If key = 10 is used, decrypt the ciphertext of a word: MIYAMI

Plaintext albcldelfahlilik mnopars t|u|V]W X
abcdefghijkmnoP||stUVWXy z
Ciphertext→A BCDEFGHIJKLMNOPQRSTUVWXYZ
Value→00 01 02/03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20/2122 23/24 25

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