Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN: 9780133594140
Author: James Kurose, Keith Ross
Publisher: PEARSON
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Problem:
Implement a Caesar cipher that can encrypt and decrypt text and file. A Caesar cipher is a
substitution cipher that shifts the letters in the original message x spaces ascending the alphabet
where x is the key.
Example if the key for the cipher is 3, and the message is “I will be there.” Then the coded
message would be “L zloo eh wkhuh”
Program requirements:
- Create a class call CCipher that has two member functions encrypt and decrypt.
- The program should be able to encrypt/decrypt a message from a file as well as a
keyboard input.
- The default key should be 3.
- The user should be able to select between encrypting and decrypting and should be
allowed to do so multiple times until s/he decides to end the program.
- The file format to be encrypted should be a “.txt” and the user should be able to provide
the name of the file to be encrypted, after which the file should be deleted.
- The user should have the option to view and/or save an encrypted/decrypted message.
- If no file name was specified, the encrypted message should be saved as “encrypt.dat”.
- If no file name was specified, the decrypted message should be saved as “decrypt.txt”.
N.B: THIS SHOULD BE A C++ PROGRAM
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