P8.7 Random monoalphabet cipher. The Caesar cipher, which shifts all letters by a fixed amount, is far toc easy to crack. Here is a better idea. As the key, don't use numbers but words. Suppose the key word is FEATHER. Then first remove duplicate letters, yielding FEATHR, and append the other letters of the alphabet in reverse order: F EATHRZYXWVUSQPONMLKJIGDC B Now encrypt the letters as follows: ABCD EFGHI JKLMNO P QR STUVWXYZ FEATHRZY XWVUS QP ON MLKJIG D C B Write a program that encrypts or decrypts a file using this cipher. For example, crypt -d -kFEATHER encrypt.txt output.txt decrypts a file using the keyword FEATHER. It is an error not to supply a keyword.

P8.7 Random monoalphabet cipher. The Caesar cipher, which shifts all letters by a fixed amount, is far toc easy to crack. Here is a better idea. As the key, don't use numbers but words. Suppose the key word is FEATHER. Then first remove duplicate letters, yielding FEATHR, and append the other letters of the alphabet in reverse order: F EATHRZYXWVUSQPONMLKJIGDC B Now encrypt the letters as follows: ABCD EFGHI JKLMNO P QR STUVWXYZ FEATHRZY XWVUS QP ON MLKJIG D C B Write a program that encrypts or decrypts a file using this cipher. For example, crypt -d -kFEATHER encrypt.txt output.txt decrypts a file using the keyword FEATHER. It is an error not to supply a keyword.

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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