The Security Analysis of Two-Step Quantum Direct Communication Protocol in Collective-Rotation Noise Channel
LI Jian1,2,3, SUN Feng-Qi1**, PAN Ze-Shi1, NIE Jin-Rui1, CHEN Yan-Hua1, YUAN Kai-Guo1
1School of Computer, Beijing University of Posts and Telecommunications, Beijing 100876 2Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026 3Science and Technology on Communication Security Laboratory, Chengdu 610041
Abstract：To analyze the security of two-step quantum direct communication protocol (QDCP) by using Einstein–Podolsky–Rosen pair proposed by Deng et al. [Phys. Rev. A 68 (2003) 042317] in collective-rotation noise channel, an excellent model of noise analysis is proposed. In the security analysis, the method of the entropy theory is introduced, and is compared with QDCP, an error rate point Q0(M:(Q0,1.0)) is given. In different noise levels, if Eve wants to obtain the same amount of information, the error rate Q is distinguishable. The larger the noise level ε is, the larger the error rate Q is. When the noise level ε is lower than 11%, the high error rate is 0.153 without eavesdropping. Lastly, the security of the proposed protocol is discussed. It turns out that the quantum channel will be safe when Q<0.153. Similarly, if error rate Q>0.153=Q0, eavesdropping information I>1, which means that there exist eavesdroppers in the quantum channel, and the quantum channel will not be safe anymore.
. [J]. 中国物理快报, 2015, 32(08): 80301-080301.
LI Jian, SUN Feng-Qi, PAN Ze-Shi, NIE Jin-Rui, CHEN Yan-Hua, YUAN Kai-Guo. The Security Analysis of Two-Step Quantum Direct Communication Protocol in Collective-Rotation Noise Channel. Chin. Phys. Lett., 2015, 32(08): 80301-080301.
2015, Vol. 32 
