Quantum Nonlocality Protecting Secure Direct Communication Against Denial-of-Service Attack

We present a secure communication protocol which allows direct secure communication. Using quantum nonlocality, information is transferred in a deterministic manner. The security of this protocol is based on the ‘High fidelity implies low entropy’. In fact, the eavesdropper-Eve can use a denial-of-service (DoS) attack to destroy a quantum communication,e.g., she can destroy the travel photon to stop a communication. But our protocol can protect communication against the DoS attack in theory.