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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: FEATHRZYXWVUSQPONMLKJ Now encrypt the letters as follows: ABCDEFGHIJKLMNOPQRSTUV IGDC B XYZ FEATHRZYXWVUSOPONMLKJIGDCB 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.

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: FEATHRZYXWVUSQPONMLKJ Now encrypt the letters as follows: ABCDEFGHIJKLMNOPQRSTUV IGDC B XYZ FEATHRZYXWVUSOPONMLKJIGDCB 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
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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Please explain in C++
**Tutorial: How to Create a Random Monoalphabet Cipher** The Caesar cipher, a method that shifts all letters by a fixed amount, is too easy to crack. Here's a better approach using a random monoalphabet cipher. Instead of using numbers as the key, let’s use a word. For example, if the keyword is "FEATHER," follow these steps: 1. **Create the New Alphabet:** - Remove duplicate letters from the keyword, resulting in "FEATHR." - Append the other letters of the alphabet in reverse order. The new sequence becomes: ``` F E A T H R Z Y X W V U S Q P O N M L K J I G D C B ``` 2. **Encrypt the Letters:** - The standard alphabet corresponds to the following: ``` A B C D E F G H I J K L M N O P Q R S T U V W X Y Z F E A T H R Z Y X W V U S Q P O N M L K J I G D C B ``` 3. **Programming the Cipher:** - Write code to encrypt or decrypt a file using this monoalphabet cipher. Example command for decryption: ``` crypt -d -kFEATHER encrypt.txt output.txt ``` This command will decrypt a file using the keyword "FEATHER." Remember, not supplying a keyword will result in an error. By following this method, you create a more secure encryption that is harder to guess, as it doesn’t rely on predictable numerical shifts.
Transcribed Image Text:**Tutorial: How to Create a Random Monoalphabet Cipher** The Caesar cipher, a method that shifts all letters by a fixed amount, is too easy to crack. Here's a better approach using a random monoalphabet cipher. Instead of using numbers as the key, let’s use a word. For example, if the keyword is "FEATHER," follow these steps: 1. **Create the New Alphabet:** - Remove duplicate letters from the keyword, resulting in "FEATHR." - Append the other letters of the alphabet in reverse order. The new sequence becomes: ``` F E A T H R Z Y X W V U S Q P O N M L K J I G D C B ``` 2. **Encrypt the Letters:** - The standard alphabet corresponds to the following: ``` A B C D E F G H I J K L M N O P Q R S T U V W X Y Z F E A T H R Z Y X W V U S Q P O N M L K J I G D C B ``` 3. **Programming the Cipher:** - Write code to encrypt or decrypt a file using this monoalphabet cipher. Example command for decryption: ``` crypt -d -kFEATHER encrypt.txt output.txt ``` This command will decrypt a file using the keyword "FEATHER." Remember, not supplying a keyword will result in an error. By following this method, you create a more secure encryption that is harder to guess, as it doesn’t rely on predictable numerical shifts.
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