A Novel Quantum Covert Channel Protocol Based on Any Quantum Secure Direct Communication Scheme |
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| Authors: | XU Shu-Jiang CHEN Xiu-Bo NIU Xin-Xin YANG Yi-Xian |
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| Affiliation: | 1. Information Security Center, State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing 100876, China;2. Shandong Provincial Key Laboratory of Computer Network, Shandong Computer Science Center, Jinan 250014, China;3. State Key Laboratory of Information Security (Institute of Information Engineering, Chinese Academy of Sciences), Beijing 100093, China |
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| Abstract: | By analyzing the basic properties of unitary transformations used in a quantum secure direct communication (QSDC) protocol, we show the main idea why a covert channel can be established within any QSDC channel which employs unitary transformations to encode information. On the basis of the fact that the unitary transformations used in a QSDC protocol are secret and independent, a novel quantum covert channel protocol is proposed to transfer secret messages with unconditional security. The performance, including the imperceptibility, capacity and security of the proposed protocol are analyzed in detail. |
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| Keywords: | quantum information hiding quantum covert channel quantum cryptography quantum communication |
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