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
icon
Related questions
Question
Please explain in C++
P8.7
Random monoalphabet cipher. The Caesar cipher, which shifts all letters by a fixed amount, is far too
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
EATHRZYXWVUSQPON MLKJ IGDC B
Now encrypt the letters as follows:
ABCD EFGH I JKLMNOP QRST U V WXY Z
FEATHRZYXWVUSQP ON MLKJ IGDC 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.
Transcribed Image Text:P8.7 Random monoalphabet cipher. The Caesar cipher, which shifts all letters by a fixed amount, is far too 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 EATHRZYXWVUSQPON MLKJ IGDC B Now encrypt the letters as follows: ABCD EFGH I JKLMNOP QRST U V WXY Z FEATHRZYXWVUSQP ON MLKJ IGDC 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.
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 3 steps

Blurred answer
Knowledge Booster
Encryption and decryption
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.
Recommended textbooks for you
Database System Concepts
Database System Concepts
Computer Science
ISBN:
9780078022159
Author:
Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:
McGraw-Hill Education
Starting Out with Python (4th Edition)
Starting Out with Python (4th Edition)
Computer Science
ISBN:
9780134444321
Author:
Tony Gaddis
Publisher:
PEARSON
Digital Fundamentals (11th Edition)
Digital Fundamentals (11th Edition)
Computer Science
ISBN:
9780132737968
Author:
Thomas L. Floyd
Publisher:
PEARSON
C How to Program (8th Edition)
C How to Program (8th Edition)
Computer Science
ISBN:
9780133976892
Author:
Paul J. Deitel, Harvey Deitel
Publisher:
PEARSON
Database Systems: Design, Implementation, & Manag…
Database Systems: Design, Implementation, & Manag…
Computer Science
ISBN:
9781337627900
Author:
Carlos Coronel, Steven Morris
Publisher:
Cengage Learning
Programmable Logic Controllers
Programmable Logic Controllers
Computer Science
ISBN:
9780073373843
Author:
Frank D. Petruzella
Publisher:
McGraw-Hill Education