🔐 Cryptography with Python

A comprehensive cryptographic toolkit demonstrating essential security operations including file hashing, encryption/decryption, and password management.

✨ Features

• File Integrity Verification - Hash files using SHA-256 and compare to detect modifications
• AES Encryption/Decryption - Symmetric encryption for secure data protection
• RSA Encryption/Decryption - Asymmetric encryption for public-key cryptography
• Password Management - Securely hash and verify passwords with industry-standard algorithms
• Interactive CLI - User-friendly command-line interface for all cryptographic operations

🛠 Technology Stack

• Python 3.x
• cryptography - Industry-standard cryptographic library
• bcrypt - Secure password hashing
• zxcvbn - Password strength estimation

📋 Requirements

See requirements.txt for complete dependencies:

bcrypt==5.0.0
cffi==2.0.0
cryptography==46.0.3
pycparser==2.23
zxcvbn==4.5.0

🚀 Installation

1. Clone the repository:

git clone https://github.com/juniorssignature21/cryptography-with-python.git
cd cryptography-with-python

2. Create a virtual environment (recommended):

python -m venv venv
source venv/bin/activate  # On Windows: venv\Scripts\activate

3. Install dependencies:

pip install -r requirements.txt

💻 Usage

Run the application:

python main.py

Interactive Menu

Once launched, you'll see the following options:

Select an option:
1. Hash a file
2. Verify file integrity
3. AES Encrypt/Decrypt
4. RSA Encrypt/Decrypt
5. Password manager
0. Exit

Examples

Hash a File:

Enter file path: sample files/circle.svg
SHA hash file is: [SHA-256 hash]

Verify File Integrity:

Enter file path 1: sample files/circle.svg
Enter file path 2: sample files/circle.svg
File is intact no modification have been made

AES Encryption:

Enter message: Hello, World!
AES Key: [generated key]
AES ciphertext: [encrypted data]
AES plaintext: [decrypted message]

RSA Encryption:

Enter a message: Secret message
[RSA encrypted and decrypted output]

Password Manager: Securely hash and verify passwords with strength analysis.

📁 Project Structure

cryptography-with-python/
├── main.py                 # Main application entry point
├── modules/
│   ├── hash.py            # File hashing and integrity verification
│   ├── encryption.py      # AES and RSA encryption/decryption
│   └── password.py        # Password management utilities
├── sample files/
│   ├── circle.svg         # Test SVG file for integrity verification
│   └── shapes.svg         # Test SVG file for integrity verification
├── requirements.txt       # Python dependencies
├── README.md              # Project documentation
└── .gitignore             # Git ignore rules

🔐 Security Note

⚠️ Educational Purpose: This project is designed for educational purposes to demonstrate cryptographic concepts and operations.

For production use, please:

• Conduct proper security audits
• Follow industry security best practices
• Implement additional security measures
• Consider using established, battle-tested libraries
• Implement proper key management strategies

🎓 Learning Resources

This project demonstrates:

• Hashing: SHA-256 algorithm for file integrity
• Symmetric Encryption: AES (Advanced Encryption Standard)
• Asymmetric Encryption: RSA public-key cryptography
• Password Security: Bcrypt hashing and ZXCVBN strength validation

🤝 Contributing

Contributions are welcome! Feel free to:

1. Fork the repository
2. Create a feature branch (git checkout -b feature/YourFeature)
3. Commit your changes (git commit -m 'Add YourFeature')
4. Push to the branch (git push origin feature/YourFeature)
5. Open a Pull Request

📝 License

This project is open source and available under the MIT License.

👨‍💻 Author

juniorssignature21

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Happy Encrypting! 🔒