  Distributed Denial-of-Service (DDoS) attacks can occur in quantum networks,
which can pose a significant threat to its key distribution protocols. We
introduce a quantum analogue of a classical entropic DDoS detection system, and
apply it in the context of detecting an attack on a quantum network. In
particular, we examine DDoS attacks on a quantum repeater and harness the
associated entanglement entropy for the detection system. Our method
contributes to the applicability of quantum information from the domain of data
security to the area of network security.

Quantum Physics;Cryptography and Security