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. Quantum key distribution (QKD) is a protocol which is provably secure, by which private bit can be created between two parties over a public channel. Based on the postulate of quantum measurement [1] and no-cloning theorem [2], different QKD protocol are presented [3-6]. Recently, A Beige et al. have presented a quantum communication [7] which allows secure direct communication. In Ref.[8], a ‘ping-pong ’ protocol has been presented, where the message is transmitted in a deterministic and direct manner. In this paper, we present a communication scheme, that allows for deterministic communication based on the quantum nonlocality. The basis idea of this protocol, establishing a secure key distribution using quantum nonlocality, has been raised by Ekert [4]. We follow this idea, but give a deterministic QKD protocol which allows a secure direct communication. The security of is protocol is based on the ‘High fidelity implies low entropy’. More novel, our protocol can protect the communication against eavesdropper-Eve’s denial-ofservice in principle. Quantum entanglement is a uniquely quantum mechanical resource that plays a key role in many of the most interesting applications of quantum computation and quantum information. Suppose Alice has two photons prepared in a Bell’s state