A Quantum Secure Direct Communication Scheme Based on Einstein-Podolsky-Rosen (EPR) Sequence

To improve the security of quantum secure direct communication protocols and reduce their cost, this paper presents a new means after analyzing the process of the eavesdropping detection, and offers a quantum secure direct communication scheme and a quantum secret sharing protocol to argue for it. Players employ the travel particles carrying secret messages to detect eavesdropping, and leak noting about secret messages. Investigation shows that players can make the quantum cryptography protocol not only with qubit efficiency of 100% but also secure in case of none checking particles made for eavesdropping detection only.