QuSec - Quantum Security Framework

QuSec is a comprehensive Quantum Security Framework designed for Quantum Digital Signature (QDS) threat detection. It leverages Qiskit to simulate a quantum-safe teleportation-based QDS protocol layered with the SARG04 decoy-state method to detect active tampering, forgery, and interception attacks.

🚀 Features

• Teleportation-Based QDS: Transmits signature payload using a 3-qubit Bell-state entanglement and Pauli corrections.
• SARG04 Protocol Integration: Employs mathematical decoy states ($\mu$, $\nu$, vacuum) for sifting and quantum channel security.
• Attack Simulations: Test real-time quantum threat vectors including Forgery, Impersonation, Intercept-Resend, Replay, and Channel Tampering.
• Multi-Backend Execution:
  • Simulator: Ideal local execution via Qiskit Aer.
  • Noisy: Local simulation mapped with a configurable depolarizing noise model.
  • Hardware: Secure execution loop ready for real IBM Quantum API connections.
• Dynamic Threat Analysis: Dynamically calculates Quantum Bit Error Rate (QBER) and statistically evaluates it against security thresholds.

📦 Installation

To install QuSec, ensure you have Python 3.9+ installed.

1. Set up a virtual environment (Recommended)

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

2. Install QuSec

Install QuSec directly in editable mode for local development:

pip install -e .

(Optional) If you plan on running your circuits on real IBM Quantum Hardware, install the hardware add-on:

pip install -e ".[hardware]"

💻 Usage

QuSec comes with a beautiful, fully-interactive Terminal User Interface (TUI).

To launch the framework and start a secure message transfer, simply run:

qusec run

Advanced Usage Flags

You can skip the interactive menus by passing parameters directly to the CLI:

• View detailed transmission steps (Bit-by-Bit):

  qusec run --verbose
  

• Select a specific execution backend:

  qusec run --backend noisy
  

• Machine-readable JSON output (Great for CI/CD or logging):

  qusec run --json
  

• Tweak the mathematical constraints:

  qusec run --shots 2000 --threshold 0.04
  

Run qusec run --help to see all available configuration options!

🛡️ Simulating Attacks

When using the interactive simulator (qusec run), you will be prompted to simulate a cyberattack vector.

1. No Attack: The message transfers securely. QBER remains $0.0$, and the signature is VERIFIED.
2. Forgery / Impersonation: Attempting to supply fake signature data. The verification layer catches the mathematical anomaly and blocks the transmission: REJECTED.
3. Quantum Channel Tampering: Induces simulated X and Z errors in the teleportation channel. You will see the QBER instantly spike above the defined threshold (default 0.06), triggering a THREAT DETECTED system halt.

🏗️ Architecture

                    QUSEC SECURITY ENGINE
                           │
                  Quantum Circuit Layer
                           │
                 Abstract Backend Manager
                           │
          ┌────────────────┼────────────────┐
          ▼                ▼                ▼
      AerSimulator    Noisy AerSimulator   Quantum Hardware
                           │
                  Measurement Results
                           │
               Projective/SARG04 Security Pipeline

Built for Smart India Hackathon problem statement SIH26141.