Design And Analysis Of Quantum Information Hiding Algorithms In Quantum Secure Communication

Quantum information hiding is a hot research topic which combines quantum cryptography and quantum communication network.It utilizes steganography technology to embed information into quantum states for covert communication.As an important application of quantum information hiding in the field of quantum secure communication,quantum image information hiding can provide the more secure technology for protection of government confidential information,business transaction information and personal privacy information,which has the important practical significance.Reviewing the existing research results of quantum image information hiding,it can be found that quantum image watermarking algorithms have fallen into the dilemma of weak robustness,and quantum image steganography algorithms are facing the challenge of how to balance the imperceptibility and embedding efficiency.Therefore,this paper designs and analyzes how to improve the robustness of quantum image watermarking algorithms and balance the imperceptibility with embedding efficiency of quantum image steganography algorithms.The specific research contents are as follows:(1)Based on the robustness of using the key to implement the controlled lowest significant qubit modification technique,as well as geometric properties of quantum log-polar image representation model(QUALPI),a robust quantum image watermarking algorithm is proposed.In view of the strong transparency but weak robustness of the lowest significant qubit modification technique,the new algorithm not only uses the quantum key distribution technology to resist the scanning and copying attack,but also utilizes the invariance of rotation and scaling of QUALPI quantum image to resist the geometric transformation attack,which can better guarantee the transparency and robustness of quantum watermarking image.(2)Based on the efficient embedding technique of exploiting modification direction(EMD)and the flexibility of enhanced quantum image representation model(NEQR),this paper proposes an efficient quantum image steganography algorithm.Compared with the low embedding efficiency of the least significant qubit modification technology,the EMD embedding has a higher embedding efficiency because modification directions to the grayvalue of different pixels in the carrier pixel group represent different secret information.Designing the quantum circuit to implement the EMD embedding provides a shortcut for understanding the embedding and extracting processes of the new algorithm.(3)Based on the efficient embedding efficiency and good imperceptibility of matrix coding,as well as the large redundancy of quantum color image representation model(NCQI),an efficient and imperceptible quantum image steganography algorithm is proposed in this paper.Similar to the EMD embedding,the high embedding efficiency of matrix coding is that the modification to the least significant qubit of different pixels in the carrier pixel group represents different secret information.At the same time,matrix coding has the advantage of good imperceptibility by modifying the least significant qubit of the carrier pixel.Based on matrix coding,the new algorithm not only avoids embedding information into the sensitive position of carrier pixels,but also effectively reduces the modification to carrier pixels.