ROT13 Cipher

Overview

This Python script provides a simple implementation of the ROT13 cipher, a type of substitution cipher that replaces each letter in a message with the letter 13 positions ahead or behind it in the alphabet.

Features

• Encryption: Encrypts a message using the ROT13 cipher.
• Decryption: Decrypts an encrypted message using the ROT13 cipher.
• Case Preservation: Preserves the case of letters during encryption and decryption.
• Handling of Non-Alphabetic Characters: Handles non-alphabetic characters in the input message by leaving them unchanged.

Usage

To use the ROT13 cipher, follow these steps:

1. Ensure you have Python installed on your system.
2. Clone this repository or download the main.py file.
3. Run the main.py file using Python.
4. Modify the message variable inside the main() function to encrypt and decrypt different messages.
5. Execute the script to see the original, encrypted, and decrypted messages.

Example

message = "This is an example message to encrypt using the ROT13 cipher!"
shift = 13
encrypted_message = encrypt(message, shift)
decrypted_message = decrypt(encrypted_message, shift)

print("Original Message:", message)
print("Encrypted Message:", encrypted_message)
print("Decrypted Message:", decrypted_message)

This will output:
Original Message: This is an example message to encrypt using the ROT13 cipher!
Encrypted Message: Guvf vf na rknzcyr zrffntr gb rapelcg hfvat gur EBG13 puvyqre!
Decrypted Message: This is an example message to encrypt using the ROT13 cipher!