A Novel Quantum Covert Channel Protocol Based on Any Quantum Secure Direct Communication Scheme  

作　　者：徐淑奖 陈秀波 钮心忻 杨义先 

机构地区：[1]Information Security Center,State Key Laboratory of Networking and Switching Technology,Beijing University of Posts and Telecommunications [2]Shandong Provincial Key Laboratory of Computer Network,Shandong Computer Science Center [3]State Key Laboratory of Information Security (Institute of Information Engineering,Chinese Academy of Sciences)

出　　处：《Communications in Theoretical Physics》2013年第5期547-553,共7页理论物理通讯（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos.61170272, 61272514, 61003287, and 61070163;Asia Foresight Program under National Natural Science Foundation of China under Grant No.61161140320;the Specialized Research Fund for the Doctoral Program of Higher Education under Grant No.20100005120002;the Fok Ying Tong Education Foundation under Grant No.131067;the Shandong Provincial Natural Science Foundation, China under Grant No.ZR2011FM023;the Shandong Province Outstanding Research Award Fund for Young Scientists of China under Grant No.BS2011DX034;the Fundamental Research Funds for the Central Universities under Grant No.BUPT2012RC0221

摘　　要：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.

关 键 词：quantum information hiding quantum covert channel quantum cryptography quantum communication 

分 类 号：O413[理学—理论物理] TN918[理学—物理]