A Novel Quantum Stegonagraphy Based on Brown States

In this paper, a quantum steganography protocol based on Brown entangled states is proposed. The new protocol adopts the CNOT operation to achieve the transmission of secret information by the best use of the characteristics of entangled states. Comparing with the previous quantum steganography algorithms, the new protocol focuses on its anti-noise capability for phase-flip noises, which proved its good security resisting on quantum noise. Furthermore, the covert communication of secret information in the quantum secure direct communication channel would not affect the normal information transmission process due to the new protocol's good imperceptibility. If the number of Brown states transmitted in cover protocol is many enough, the imperceptibility of the secret channel can be further enhanced. In aspect of capacity, the new protocol can further expand its capacity by combining with other quantum steganography protocols. Because the proposed protocol does not require the participation of the classic channel when it implements the transmission of secret information, it does not cause any additional information leakage and has good security. The detailed theoretical analysis shows the conclusions that the new protocol has good performance on imperceptibility, capacity and security.