Quantum secure direct communication scheme with identity authentication

Aiming at the problem that traditional quantum secure direct communication schemes need to assume the legitimacy of both parties in advance, a GHZ state based quantum secure direct communication scheme with identity authentication is proposed. The scheme first encodes GHZ state particles into eight types, divides them into three parts, and sends them in three times. Each time, eavesdropping is added to detect whether the particle detection channel is secure, and the second time, identity authentication is added to verify the identity of the receiver. Specifically, according to the value of the ID key IDA, the specified particles (such as | 0>particles or |+>particles) are found in the two particles, Then mark their position L and traverse down until all the identity keys are traversed to obtain a position sequence L. After sending the two particles to Bob for eavesdropping detection, Bob measures the L position of the two particles with the corresponding basis according to the value of the identity key, codes the measurement results, and compares them with the identity key IDA to complete the identity authentication. After sending the particles for the third time, The receiver extracts all the detected particles, and then jointly measures the GHZ state particles, and recovers the original information through the originally given coding rules, so as to realize quantum safe direct communication. The design of this scheme is simple and efficient, and communication can be realized without complex unitary transformation. The correctness analysis proves that the scheme is correct in theory. The security analysis of interception/measurement retransmission attack, trojan horse attack, denial of service attack, auxiliary particle attack, identity impersonation attack and other attacks proves that the scheme can resist common internal attacks and external attacks, and solve the problem of information leakage. The transmission efficiency of the scheme is 1, the quantum bit utilization is 1, and the coding capacity is a quantum state carrying 3 bits of information, Compared with some previous schemes, this scheme has obvious advantages in these three aspects. The biggest advantage is that the sender does not need to assume the legitimacy of the receiver when sending information, so it has high practical application value.