🔏 Digital Signature System

📌 Project Overview

The Digital Signature System ensures the authenticity, integrity, and security of digital documents using SHA-256 hashing and RSA encryption. It allows users to sign and verify documents, ensuring they remain unaltered.

✨ Features

• ✅ Secure Hashing (SHA-256): Creates a cryptographic hash of documents.
• ✅ Digital Signature Generation: Signs the document using RSA encryption.
• ✅ Signature Verification: Confirms authenticity and detects modifications.
• ✅ Base64 Encoding Support: Provides encoded versions of signatures.
• ✅ Comprehensive Logging: Logs all signing and verification activities.

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📁 Project Structure

digital-signature-system/
│── images/                          # Contains project-related images
│── output/                          # Stores generated outputs
│   ├── keys/                        # RSA Key Pair storage
│   │   ├── confidential_document_modified.txt
│   │   ├── confidential_document.txt
│   │   ├── confidential_document.txt.sig
│   │   ├── confidential_document.txt.sig.b64
│   ├── secret_plans.pdf
│   ├── secret_plans.pdf.sig
│   ├── secret_plans.pdf.sig.b64
│   ├── signature_info.log           # Logs signing & verification activities
│── report/                          # Stores reports
│   ├── digital_signature_system.pdf
│── .gitignore                        # Ignores unnecessary files in Git
│── digital_sig_sys.ipynb             # Jupyter Notebook implementation
│── README.md                         # Project documentation

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🛠️ Installation & Setup

1️⃣ Clone the Repository

git clone https://github.com/neuralnouman/digital-signature-system.git
cd digital-signature-system

2️⃣ Create a Virtual Environment (Recommended)

python -m venv venv
source venv/bin/activate  # macOS/Linux
venv\Scripts\activate     # Windows

3️⃣ Install Dependencies

pip install -r requirements.txt

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🚀 Usage Guide

🔹 Running the Digital Signature System

Since all functionality is implemented in Jupyter Notebook, follow these steps:

1. Launch Jupyter Notebook

   jupyter notebook

2. Open digital_sig_sys.ipynb
3. Run all cells sequentially to:
   • Generate keys
   • Sign documents
   • Verify signatures
   • Detect modifications

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🔐 Security Considerations

• SHA-256 is collision-resistant, ensuring secure hashing.
• RSA encryption ensures authenticity, preventing unauthorized alterations.
• Any modification to the document results in verification failure.

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📜 License

This project is licensed under the MIT License. See LICENSE for details.

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🤝 Contributing

1. Fork the repository.
2. Create a feature branch:

   git checkout -b feature-branch

3. Commit changes:

   git commit -m "Added new feature"

4. Push to your fork:

   git push origin feature-branch

5. Submit a Pull Request.

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📧 Contact

👤 Muhammad Nouman Hafeez
📍 FAST NUCES, Islamabad
📧 noumanhafeez.nh11@gmail.com
🔗 GitHub Profile
🔗 LinkedIn Profile

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