Passive attack to the controlled secure direct communication with seven-qubit entangled states protocol

被引：2
作者：
Liu, Zhihao [1 ]
Chen, Han-Wu [1 ]
Liu, Wenjie [1 ,2 ,3 ]
机构：
[1] Southeast Univ, Sch Comp Sci & Engn, Nanjing 211189, Jiangsu, Peoples R China
[2] Southeast Univ, Minist Educ, Key Lab Comp Network & Informat Integrat, Nanjing 211189, Jiangsu, Peoples R China
[3] Nanjing Univ Informat Sci & Technol, Sch Comp & Software, Nanjing 210044, Jiangsu, Peoples R China
来源：
MODERN PHYSICS LETTERS A | 2020年 / 35卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Quantum cryptography; controlled quantum secure direct communication; passive attack; information leakage; QUANTUM; IMPROVEMENT;
D O I：
10.1142/S0217732319503437
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
It is found that the controlled quantum secure direct communication (CQSDC) based on a seven-qubit entangled state protocol [S. K. Wang, X. W. Zha and H. Wu, Int. T. Theor. Phys. 57, 48 (2018)] can be passively attacked. That is to say, this protocol has the security loophole of information leakage. To be specific, the first bit of the sender's two-bit message can be deduced by an attacker Eve according to the first and the third bits of Alice's announcement and the first bit of the controller Charlie's announcement. Then, a way to fix this loophole is discussed.
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页数：8
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