Message M & A Positive Integer K Encrypt This Message Using Cipher Problems

Question Description

I’m working on a discrete math question and need guidance to help me learn.

Given a message m and a positive integer k less than 26, encrypt this message using the cipher with key k; and a given a message encrypted c using a shift cipher with key k, decrypt this message.

Here is the example run:

Please select the mode (e)ncode or (d)ecode: e Please enter the plaintext: DISCRETE STRUCTURES Please enter the key: 5
Encrypted message: INXHWJYJ XYWZHYZWJX

Please select the mode (e)ncode or (d)ecode: d Please enter the ciphertext: INXHWJYJ XYWZHYZWJX Please enter the key: 5
Decrypted message: DISCRETE STRUCTURES

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