Programming Challenge: Caesar Cipher Encoder/Decoder (Jan 12, 2025)

Write a program that implements a Caesar Cipher, one of the simplest encryption techniques. The program should be able to both encrypt and decrypt text using a given shift value.

Basic Requirements:

1. Accept a message from the user.

2. Accept a shift value (e.g., 3 shifts each letter forward by 3).

3. Provide options to encrypt or decrypt the message.

4. Handle both uppercase and lowercase letters.

Bonus Features:

• Handle non-alphabetic characters by leaving them unchanged.

• Allow the user to brute-force decrypt a message by trying all possible shift values.

• Implement a case-insensitive mode to ignore letter casing in the input.

Example Output:

Choose an option: (1) Encrypt (2) Decrypt
> 1
Enter the message: Hello World!
Enter shift value: 3
Encrypted message: Khoor Zruog!

Choose an option: (1) Encrypt (2) Decrypt
> 2
Enter the message: Khoor Zruog!
Enter shift value: 3
Decrypted message: Hello World!