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practical security against linear cryptanalysis for SMS4-like ciphers with SP round function

Science China(Information Sciences) 2012年第9期55卷 2161-2170页

作者： ZHANG Bin 1,2 & JIN ChenHui 2 1 P.O.Box 1936,Beijing 100193,China 2 Electronic Technology Institute,Information Engineering University,Zhengzhou 450004,China Beijing China Electronic Technology Institute Information Engineering University Zhengzhou China

SMS4,a block cipher whose global structure adopts a special unbalanced Feistel scheme with SP round function,is accepted as the Chinese National Standard for securing Wireless *** this paper,in order to evaluate the security against linear cryptanalysis,we examine the upper bound of the maximum linear characteristic probability of SMS4-like ciphers with SP round *** the same way as for SPN ciphers,it is sufficient to consider the lower bound of the number of linear active *** propose a formula to compute the lower bound of the number of linear active s-boxes with regard to the number of *** security threshold of SMS4-like ciphers can be estimated easily with our ***,if the number of input words in each round of SMS4-like cipher is m,we find that it is unnecessary for designers to make the linear branch number of P greater than 2 m with respect to linear cryptanalysis.

关键词： block cipher SMS4-like cipher practical security linear cryptanalysis

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Quantum key distribution system against the probabilistic faint after-gate attack

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Communications in Theoretical Physics 2020年第11期72卷 43-47页

作者： Meng Ye Jian-Hui Li Yong Wang Peng Gao Xin-Xin Lu Yong-Jun Qian Power Generation Company GuangZhou 510700China Anhui Qasky Quantum Technology Co. Ltd.Wuhu 241102China

In practical quantum key distribution(QKD)systems,a single photon-detector(SPD)is one of the most vulnerable *** after-gate attack is a universal attack against the ***,the original faint after-gate attack can be discovered by monitoring the *** paper presents a probabilistic generalization of the attack,which we refer to as probabilistic faint after-gate attack,by introducing probability control *** countermeasures for photocurrent monitoring may fail in detecting the eavesdropper under some specific *** mitigate this threat,we provide a method to determine the detectable boundary in the limitation of precision of photocurrent monitoring,and investigate the security of QKD systems under such boundaries using the weak randomness model.

关键词： quantum key distribution practical security single photon-detector weak randomness model

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Experimental measurement-device-independent type quantum key distribution with flawed and correlated sources

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Science Bulletin 2022年第21期67卷 2167-2175页

作者： Jie Gu Xiao-Yu Cao Yao Fu Zong-Wu He Ze-Jie Yin Hua-Lei Yin Zeng-Bing Chen National Laboratory of Solid State Microstructures and School of Physics Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China MatricTime Digital Technology Co.Ltd. Nanjing 211899China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China

The security of quantum key distribution(QKD)is severely threatened by discrepancies between realistic devices and theoretical ***,a significant framework called the reference technique was proposed to provide security against arbitrary source flaws under current technology such as state preparation flaws,side channels caused by mode dependencies,the Trojan horse attacks and pulse ***,we adopt the reference technique to prove security of an efficient four-phase measurement-device-independent QKD using laser pulses against potential source *** present a characterization of source flaws and connect them to experiments,together with a finite-key analysis against coherent *** addition,we demonstrate the feasibility of our protocol through a proof-of-principle experimental implementation and achieve a secure key rate of 253 bps with a 20 d B channel *** with previous QKD protocols with imperfect devices,our study considerably improves both the secure key rate and the transmission distance,and shows application potential in the practical deployment of secure QKD with device imperfections.

关键词： Measurement-device-independent Quantum key distribution Reference technique Source flaw characterization practical security

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