Networked quantum communication services enable data transmission using quantum cryptography over a distributed network. Combining entanglement-based networks and quantum packets, while relying on classical communication and Post-Quantum Cryptographic (PQC) security only for coordination and support, we explore novel quantum-safe designs over Quantum Key Distribution (QKD) and Quantum Secure Direct Communication (QSDC) systems, extending the Quantum Internet Simulation Package (QuISP). We explore the impact of eavesdroppers, attacks on prepared states, and side-channeling, as well as traditional networking issues, such as routing and congestion avoidance. We test the impact of stealthy adversarial strategies and tackle how to distinguish malicious attacks from system malfunctions, as each requires a fundamentally different response (e.g., error correction vs. attack mitigation).
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