Journal
OPTICS COMMUNICATIONS
Volume 284, Issue 7, Pages 2075-2082Publisher
ELSEVIER
DOI: 10.1016/j.optcom.2010.12.031
Keywords
Quantum steganography; chi-type entangled state; Quantum secure direct communication; Entanglement swapping
Categories
Funding
- National Basic Research Program of China (973 Program) [2007CB311203]
- Specialized Research Fund for the Doctoral Program of Higher Education [20070013007, 20100005120002]
- National Natural Science Foundation of China [61003287, 60821001]
- Fundamental Research Funds for the Central Universities [BUPT2009RC0220]
- 111 Project [B08004]
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In this paper, we firstly propose a new simple method to calculate entanglement swapping of chi-type entangled states, and then present a novel quantum steganography protocol with large payload. The new protocol adopts entanglement swapping to build up the hidden channel within quantum secure direct communication with chi-type entangled states for securely transmitting secret messages. Comparing with the previous quantum steganographies, the capacity of the hidden channel is much higher, which is increased to eight bits. Meanwhile, due to the quantum uncertainty theorem and the no-cloning theorem its imperceptibility is proved to be great in the analysis, and its security is also analyzed in detail, which is proved that intercept-resend attack, measurement-resend attack, ancilla attack, man-in-the-middle attack or even Dos(Denial of Service) attack couldn't threaten it. As a result, the protocol can be applied in various fields of quantum communication. (c) 2011 Elsevier B.V. All rights reserved.
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