⚔️ Caesar Playfair Cipher

This project is a Python-based GUI cryptography tool that implements Caesar and Playfair ciphers. It allows users to encrypt and decrypt messages through an interactive, user-friendly interface while demonstrating core classical cryptography concepts in a practical and educational way.

Screenshots

📌 Project Overview

This project is a Python-based graphical cryptography application that demonstrates classical encryption and decryption techniques using Caesar Cipher and Playfair Cipher. The tool is designed for beginners to intermediate learners to understand how classical ciphers work through a clean, interactive, and user-friendly GUI. Users can easily encrypt and decrypt messages while visually interacting with the cryptographic process.

The application focuses on functionality, usability, and educational value, making it suitable for academic projects, cybersecurity basics, and cryptography learning.

🎯 Features

• Fully functional Caesar Cipher encryption and decryption
• Fully functional Playfair Cipher encryption and decryption
• GUI-based application (no command-line usage required)
• Dynamic interface that updates based on cipher selection
• Input validation with friendly error messages
• Copy-to-clipboard functionality for encrypted/decrypted output
• Responsive and beginner-friendly UI/UX
• Clean separation of cryptography logic and GUI code

🛠️ Technologies Used

• Python 3.x
• Tkinter / CustomTkinter (for GUI)
• Standard Python libraries only (no external dependencies required)

⚙️ How the Application Works

Caesar Cipher

• User enters a message (plaintext or ciphertext)
• User provides a numeric shift key
• On clicking Encrypt, the message is shifted forward
• On clicking Decrypt, the message is shifted backward
• Output is displayed instantly in the result area

Playfair Cipher

• User enters a secret key
• The system generates a 5×5 Playfair matrix internally
• Message is processed into digraphs following Playfair rules
• Encryption and decryption follow:
  • Same row rule
  • Same column rule
  • Rectangle rule
• Output is displayed with correct formatting

▶️ How to Run the Project

Step 1: Install Python

Ensure Python 3.x is installed on your system.

Check version:

python --version

Step 2: Clone or Download the Project

git clone https://github.com/SyedShaheerHussain/Caesar-Playfair-Cipher-Implementation-GUI-.git

OR download the ZIP and extract it.

Step 3: Navigate to Project Directory

cd Caesar & Playfair Cipher Implementation

Step 4: Run the Application

python main.py

The GUI window will open automatically.

🖥️ GUI Usage Instructions

1. Launch the application

2. Select Caesar Cipher or Playfair Cipher

3. Enter the required inputs (message, key/shift)

4. Click Encrypt or Decrypt

5. View and copy the result from the output box

🚫 Input Validation & Error Handling

1. Empty inputs are not allowed

2. Shift key accepts only numeric values

3. Playfair key automatically removes duplicates

4. Friendly error messages guide the user

📚 Educational Value

This project helps users:

1. Understand classical cryptography concepts

2. Learn encryption vs decryption logic

3. Practice Python GUI development

4. Apply algorithmic thinking in real-world scenarios

🔮 Future Enhancements

• Add more classical ciphers (Vigenère, Rail Fence)

• Dark mode UI

• Export encrypted text to file

• Visual Playfair matrix display

👨‍💻 Author

Developed as an educational cryptography project using Python. (© Syed Shaheer Hussain)

⭐ Support & Engagement

If you find this repository useful or insightful, please consider:

• ⭐ Starring the repository
• 🔁 Sharing it within your network
• 👤 Following my GitHub profile for future projects and updates

Your support helps drive continued innovation and open-source contributions.

— Syed Shaheer Hussain

📜 License

Note

This project is open-source and free to use for educational purposes.