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This paper proposes an efficiency quantum image steganography protocol based on improved exploiting modification direction algorithm (QIS-IEMD). The new methods of expanding modification range and dynamically sharing between subgroups are introduced in the new protocol. Compared with the quantum image steganography protocol based on EMD algorithm (QIS-EMD), secret information can be embedded on multiple bit planes after expanding pixel's modification range, and the carrier pixel groups can be dynamically shared to achieve higher embedding efficiency, embedding rate and larger capacity. In addition, in order to reflect the feasibility and practicability of QIS-IEMD, dedicated quantum circuits for embedding and extracting secret information are designed for it. Finally, the experimental results and detailed mathematical analysis prove that, compared with QIS-EMD, QIS-IEMD not only performs well in imperceptibility, but also significantly increases embedding efficiency, embedding rate and capacity. [ABSTRACT FROM AUTHOR]

This paper proposed a secure authenticated quantum video steganography protocol with large capacity. The new protocol can embed secret quantum information into carrier quantum video, and expand the embedding capacity to a large extent. It also manages to accomplish quantum information steganography process based on unique features of video as well as authentication mechanism for better security. Finally, the simulation experiment proves that the new protocol not only has good performance on imperceptibility and security, but also owns a large capacity. [ABSTRACT FROM AUTHOR]

An anti-noise bidirectional quantum steganography protocol with large payload protocol is proposed in this paper. In the new protocol, Alice and Bob enable to transmit classical information bits to each other while teleporting secret quantum states covertly. The new protocol introduces the bidirectional quantum remote state preparation into the bidirectional quantum secure communication, not only to expand secret information from classical bits to quantum state, but also extract the phase and amplitude values of secret quantum state for greatly enlarging the capacity of secret information. The new protocol can also achieve better imperceptibility, since the eavesdropper can hardly detect the hidden channel or even obtain effective secret quantum states. Comparing with the previous quantum steganography achievements, due to its unique bidirectional quantum steganography, the new protocol can obtain higher transmission efficiency and better availability. Furthermore, the new algorithm can effectively resist quantum noises through theoretical analysis. Finally, the performance analysis proves the conclusion that the new protocol not only has good imperceptibility, high security, but also large payload. [ABSTRACT FROM AUTHOR]

The Internet has become an increasingly appealing medium for telecare medicine information systems (TMISs). However, the open nature of the Internet poses serious security threats and vulnerabilities to TMISs and privacy concerns to the patients and medical personnel. This work proposes a hybrid quantum key distribution protocol to provide security in TMISs, leveraging the key agreement of classical and quantum key distribution. Our protocol induces low energy and computation overheads to achieve privacy and trusted operations for TMISs. This is because quantum key distribution employs the principles of quantum mechanics rather than computational complexity, to avoid various attacks such as the man-in-the-middle attacks, the replay attacks and the passive attacks. Meanwhile, classical cryptography can be used to achieve user authentication efficiently. Therefore, our protocol may be available with the rapid developments of extensive experiments for quantum key distribution. [ABSTRACT FROM AUTHOR]