Post-Quantum Secure File Transfer System

Overview

This project implements a complete Post-Quantum Cryptography (PQC) secure file transfer system using NIST-standardized algorithms.

It demonstrates how quantum-safe cryptography can be deployed on classical infrastructure.

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Algorithms Used

Post-Quantum Key Exchange

CRYSTALS-Kyber (ML-KEM-768)

Post-Quantum Digital Signatures

CRYSTALS-Dilithium (ML-DSA-65)

Symmetric Encryption

AES-GCM (Hybrid encryption model)

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Features

• PQC-based key encapsulation
• PQC digital signature generation and verification
• Secure file encryption and decryption
• End-to-end secure transfer simulation
• Performance comparison with RSA

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Tech Stack

• Python
• liboqs (Open Quantum Safe)
• Cryptography library
• Google Colab (Linux environment)

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Why This Matters

Classical algorithms like RSA and ECC are vulnerable to quantum attacks (Shor’s algorithm).
This system demonstrates a quantum-safe alternative ready for future security needs.

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How to Run

This project is implemented in Google Colab.

1. Install dependencies

pip install -r requirements.txt

2. Open the notebook

PQC_implementation.ipynb

3. Run all cells sequentially to execute:

• Post-Quantum key exchange
• Digital signature generation and verification
• Secure file encryption and decryption
• Performance comparison with RSA

Note: The project was developed and tested in a Linux-based Google Colab environment.

Demo Output

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Sample Results

• Shared secret match = True
• Signature verification = Valid
• File encrypted and decrypted successfully
• Performance comparison with RSA completed