Caesar Cipher Encryption and Decryption

This is a Python implementation of the Caesar Cipher, a simple encryption technique that shifts each letter in the plaintext by a specified number of places. The program supports both encryption and decryption of messages.

Features

• Encryption: Shifts each letter in the text by a specified shift value to create an encrypted message.
• Decryption: Reverses the shift to retrieve the original message.
• Handles both uppercase and lowercase letters.
• Leaves non-alphabetic characters unchanged.

How It Works

• The program uses the ASCII values of characters to calculate the shifted positions.
• Uppercase and lowercase letters are handled separately to maintain case sensitivity.
• Non-alphabetic characters (e.g., numbers, spaces, punctuation) remain unaltered.

Prerequisites

• Python 3.x installed on your system.

Usage

1. Clone the repository (if applicable):

   git clone https://github.com/tholumuzikhuboni/PRODIGY_CY_01.git
   cd PRODIGY_CV_01
   

2. Run the script:

   python caesar-cipher.py
   

3. Follow the on-screen instructions:
   • Choose whether to encrypt or decrypt a message.
   • Enter the message to process.
   • Enter a shift value (integer).

Example

Encryption

Input:

• Operation: encrypt
• Message: Hello, World!
• Shift: 3

Output:

Encrypted message: Khoor, Zruog!

Decryption

Input:

• Operation: decrypt
• Message: Khoor, Zruog!
• Shift: 3

Output:

Decrypted message: Hello, World!