Caesar Cipher Tool

A simple Python implementation of the classic Caesar Cipher encryption and decryption algorithm. This tool allows you to encrypt or decrypt text by shifting the letters by a specified number of positions.

Features

• Encrypt or decrypt any text using the Caesar Cipher.
• Supports both uppercase and lowercase letters.
• Retains non-alphabetic characters (spaces, punctuation, numbers).
• Input validation for shift value and mode.

Usage

1. Run the script:

   python caesar cipher.py
   

2. Follow the prompts:

   • Enter your text to encrypt or decrypt.
   • Enter a shift value (an integer between 1 and 25).
   • Choose the mode: encrypt or decrypt.

3. View the result:

   • The processed text will be displayed, showing the original text, shift value, mode, and result.

Example

=== Caesar Cipher Tool ===
Enter your text: Hello, World!
Enter shift value (1-25): 3
Choose mode (encrypt/decrypt): encrypt

Original text: Hello, World!
Shift: 3
Mode: encrypt
Result: Khoor, Zruog!

How It Works

• Encryption: Each letter in the text is shifted forward by the specified value.
• Decryption: Each letter is shifted backward by the specified value.
• Non-alphabetic characters are left unchanged.

Functions

• caesar_cipher(text, shift, mode='encrypt')
  Processes the text with the specified shift and mode.

• main()
  Command-line interface for user interaction.

Requirements

• Python 3.x

License

This project is open source. See LICENSE for details.