Caesar Cipher (Python)

This project is a simple implementation of the Caesar Cipher, one of the oldest and most basic encryption techniques.
It allows the user to encrypt or decrypt a message by shifting letters of the alphabet by a fixed number.

This project was created as part of my Python learning journey and helped me understand string manipulation and encryption logic.

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🔐 What is Caesar Cipher?

The Caesar Cipher works by shifting each letter in a message by a certain number of positions in the alphabet.

Example (Shift = 3): encoding A → D B → E C → F

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🛠 Concepts Used

• for loops
• if / else conditions
• Strings and indexing
• Modulo operator %
• Basic encryption & decryption logic
• User input handling

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▶️ How the Program Works

1. The user chooses whether to encrypt or decrypt
2. The user enters a message
3. The user enters a shift number
4. The program shifts each letter accordingly
5. The encrypted or decrypted message is displayed

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▶️ How to Run the Program

1. Make sure Python is installed
2. Download or clone this repository
3. Run the program using:

python caesar_cipher.py