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中国密码学会2017年密码算法学术会议

作者： Lu-Yang Li Wei-Guo Zhang Science and Technology on Communication Security Laboratory Chengdu 610041 State Key Laboratory of Integrated Services Networks Xidian University Xi'an 710071

Vectorial Boolean functions are used as the nonlinear components in stream *** security of the cipher system depends on the cryptographic properties of the *** widely accepted criteria are balancedness,high nonlinearity,correlation immune and so *** this paper,we present a new construction method of balanced vectorial Boolean functions with strictly almost optimal *** the first time,the first-order correlation immune functions with currently best known nonlinearity 2n-1-2n/2-1-2[n/4」 are *** is also shown that our functions can have good algebraic degree.

关键词： Vectorial Boolean functions stream ciphers nonlinearity balancedness correlation immunity

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Identification of Block Ciphers under CBC Mode

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Procedia Computer science 2018年 131卷 65-71页

作者： Cheng Tan Xiaoyan Deng Lijun Zhang Science and Technology on Communication Security Laboratory No. 8 of Venture Road Chengdu 610041 Sichuan Province China College of Applied Mathematics Chengdu University of Information Technology No. 24 of Xuefu Road Chengdu 610103 Sichuan Province China

It has been challenging work to identify block ciphers under CBC mode over the past few decades. But we can still conduct the identification of block ciphers under CBC mode if enough ciphertext streams are available. In this paper, we consider the identification of 5 frequently used block ciphers, AES, DES, 3DES, RC5 and Blowfish. For multi-class identification, the identification rate of 5 block ciphers can reach above 90% as long as the size of ciphertext file is larger than 100 KB when same key and same IV for training and testing ciphertext files. For one to one identification, we identify AES from other 4 block ciphers on condition of different keys or different IVs for training and testing ciphertext files. We can obtain an identification rate of above 97% when the size of ciphertext file is equal to 100 KB. Besides, even if the size of ciphertext file is only 4 KB, the average identification rate is still higher than 80%.

关键词： Identification of block ciphers Block cipher CBC mode Ciphertext

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Frequency-shifted Self-Heterodyne Measurement for Both Magnitude and Phase Response of Optical Filters

Frequency-shifted Self-Heterodyne Measurement for Both Magni...

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Asia communications and Photonics Conference

作者： Mengke Wang Shangjian Zhang Xinhai Zou Heng Wang Zhiyao Zhang Yali Zhang Yong Liu State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China Chengdu 610054 China Science and Technology on Communication Security Laboratory Institute of Southwestern Communication Chengdu 610041 China

We demonstrate a frequency-shifted self-heterodyne method for evaluating the characteristics of optical filters. The method enables simultaneously extracting the magnitude- and phase-frequency response within wide fre... 详细信息

ISBN: (纸本)9781943580705

关键词： Analytical techniques Dense wavelength division multiplexing Diode lasers Fiber Bragg gratings Optical signals Phase measurement

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More practical power analysis attack on LFSR based stream ciphers

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Journal of Information and Computational science 2012年第12期9卷 3517-3527页

作者： Jia, Yanyan Hu, Yupu Zhang, Wenzheng Department of Computer Science Xi'an University of Science and Technology Xi'an 710054 China Laboratory of Computer Networks and Information Security Xidian University Xi'an 710071 China Science and Technology on Communication Security Laboratory The 30th Research Institute of China Electronics Technology Group Corporation Chengdu 610041 China

Power analysis attack is a powerful cryptanalytic technique aiming to extract the secret data from a cryptographic device by collecting and analyzing power consumption traces. In this paper, we present a practical power analysis attack on Linear Feedback Shift Registers (LFSR) based stream ciphers. Based on Information Theory, the problem of the power analysis attack is converted into the problem of decoding over a 3-ary symmetric channel. By setting two thresholds, the attack algorithm can significantly eliminate the effect of noise. And therefore, the correctness of decoding is enhanced. Compared with Burman's attack, the proposed attack algorithm is much more practical since the algorithmic noise and electronic noise are taken into account. Simulation results show that when the Signal to Noise Ratio (SNR) is higher than -6.5dB, the algorithm can always be practically performed and effective. © 2012 Binary Information Press.

关键词： Side channel attack

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Efficient decoy states for the reference-frame-independent measurement-device-independent quantum key distribution

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Physical Review A 2020年第5期101卷 052318-052318页

作者： Feng-Yu Lu Zhen-Qiang Yin Guan-Jie Fan-Yuan Rong Wang Hang Liu Shuang Wang Wei Chen De-Yong He Wei Huang Bing-Jie Xu Guang-Can Guo Zheng-Fu Han Key Laboratory of Quantum Information CAS Center For Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Hefei 230026 China State Key Laboratory of Cryptology P. O. Box 5159 Beijing 100878 China Science and Technology on Communication Security Laboratory Institute of Southwestern Communication Chengdu Sichuan 610041 China

Reference-frame-independent measurement-device-independent quantum key distribution (RFI-MDI-QKD) is a novel protocol that eliminates all possible attacks on the detector side and the necessity of reference-frame alignment in source sides. However, its performance may degrade notably due to statistical fluctuations since more parameters, e.g., yields and error rates for mismatched-basis events, must be accumulated to monitor the security. In this work, we find that the original decoy states method estimates these yields overpessimistically since it ignores the potential relations between different bases. Through jointly processing parameters of different bases, the performance of RFI-MDI-QKD is greatly improved in terms of the secret key rate and achievable distance when statistical fluctuations are considered (the statistical fluctuation analysis is the first step to the final analysis of the finite key size effect). Our results pave an avenue towards practical RFI-MDI-QKD.

关键词： Quantum cryptography

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Improving the performance of twin-field quantum key distribution

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Physical Review A 2019年第2期100卷 022306-022306页

作者： Feng-Yu Lu Zhen-Qiang Yin Chao-Han Cui Guan-Jie Fan-Yuan Rong Wang Shuang Wang Wei Chen De-Yong He Wei Huang Bing-Jie Xu Guang-Can Guo Zheng-Fu Han Key Laboratory of Quantum Information CAS Center For Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Hefei 230026 China State Key Laboratory of Cryptology P.O. Box 5159 Beijing 100878 China Science and Technology on Communication Security Laboratory Institute of Southwestern Communication Chengdu Sichuan 610041 China

Among the various versions of the twin-field quantum key distribution (TF-QKD) protocol [M. Lucamarini, Z. Yuan, J. Dynes, and A. Shields, Nature (London) 557, 400 (2018)] that can overcome the rate-distance limit, the TF-QKD without phase postselection proposed by Cui et al. [Phys. Rev. Appl. 11, 034053 (2019)] is an elegant TF-QKD that can provide high key rates since the postselection of global phases has been removed. However, the achievable distance of this variant is shorter than that of the original phase-matching QKD [X. Ma, P. Zeng, and H. Zhou, Phys. Rev. X 8, 031043 (2018)]. In this paper, we propose a method for improving its performance by introducing an additional decoy mode. The upper bound of the information leakage can be more tightly estimated; hence, both the key rate and the achievable distance are significantly improved. Interestingly, the operation of the proposed additional decoy mode is the same as that of the code mode; hence, it does not introduce difficulties into the experimental system. In addition, the improvement is substantial with finite decoy states, which is meaningful in practice.

关键词： Quantum cryptography

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Selection of optimal architecture of rapid gradient descent method based on iterative design

International Journal of Digital Content Technology and its ...

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International Journal of Digital Content technology and its Applications 2012年第23期6卷 381-391页

作者： Wei, Wei Shen, Peiyi Hao, Meiping Song, Juan Zhang, Liang Xu, Hu Zhang, Wenzheng Wang, Wei School of Computer Science and Engineering XI'an University of technology XI'an 710048 China National school of software Xidian University 710071 Xi'an Shaanxi China Science and Technology on Communication Security Laboratory 610041 Chengdu China

Software testing is essential to ensure that the software Quality. On most software projects testing activities consume at least 30 percent of the project effort. On safety critical applications, software testing can consume between 50 to 80 percent of project effort. While the scale of software development and application expands dramatically, to guarantee the quality and reliability of software is becoming a huge challenge. For the ever-expanding software to reach the standard of Software Engineering, the best possible testing should be applied. During the testing, automatic generation of test data is especially important for improving testing efficiency. This paper presents the results of the author's study on problems and algorithms related to the automatic generation of software testing data. Results indicated that the method designed by the author can be used to perform iterative computation on needed data more efficiently, and then reach an essentially feasible solution. Although the exploratory study presented here proved rather demanding because few had adopted the approach, it has achieved positive results in improving the validity and the temporal and spatial complexity of the existent iterative algorithm.

关键词： Software testing

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LEACH-based energy-conserved improved protocol for WSNs

International Journal of Digital Content Technology and its ...

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International Journal of Digital Content technology and its Applications 2012年第23期6卷 163-171页

作者： Wei, Wei Shen, Peiyi Zhang, Liang Xu, Hu Song, Juan Zhang, Wenzheng Wang, Wei School of Computer Science and Engineering XI'an University of Technology XI'an 710048 China National school of Software Xidian University 710071 Xi'an Shaanxi China Science and Technology on Communication Security Laboratory 610041 Chengdu China

In wireless sensor networks (WSNs) environment, since the battery limitation of the node energy, energy efficiency is an key factor should be considered as the communication methods are designing. As classical and hierarchical routing protocols, Leach Protocol plays an important role. In response to the uneven energy distribution that is caused by the randomness of cluster heads forming, this paper presents a increased method of Leach protocol which is intended to trade off the energy consumption of the entire network and extend the life of the network. The new algorithm is verified by simulation platform, the simulation results show that the energy consumption and the lifetime of the network are both well improved than that of original Protocol.

关键词： Energy utilization

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Sums of polynomial-type exceptional units modulo n

arXiv

引用

arXiv 2021年

作者： Zhao, Junyong Hong, Shaofang Zhu, Chaoxi Mathematical College Sichuan University Chengdu610064 China School of Mathematics and Statistics Nanyang Institute of Technology Nanyang473004 China Science and Technology on Communication Security Laboratory Chengdu610041 China

Let f(x) ∈ Z[x] be a nonconstant polynomial. Let n, k and c be integers such that n ≥ 1 and k ≥ 2. An integer a is called an f-exunit in the ring Zn of residue classes modulo n if gcd(f(a), n) = 1. In this paper, we use the principle of cross-classification to derive an explicit formula for the number Nk,f,c(n) of solutions (x1,..., xk) of the congruence x1 +... + xk ≡ c (mod n) with all xi being f-exunits in the ring Zn. This extends a recent result of Anand et al. [On a question of f-exunits in Z/nZ, Arch. Math. (Basel) 116 (2021), 403-409]. We derive a more explicit formula for Nk,f,c(n) when f(x) is linear or quadratic. Copyright © 2021, The Authors. All rights reserved.

关键词： Polynomials

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On the number of zeros to the equation f(x1)+⋯+f(xn)=a over finite fields

arXiv

引用

arXiv 2021年

作者： Zhu, Chaoxi Feng, Yulu Hong, Shaofang Zhao, Junyong Science and Technology on Communication Security Laboratory Chengdu610041 China Mathematical College Sichuan University Chengdu610064 China School of Mathematics and Statistics Nanyang Institute of Technology Nanyang473004 China

Let p be a prime, k a positive integer and let Fqbe the finite field of q = pkelements. Let f(x) be a polynomial over Fq and a ∈ Fq. We denote by Ns(f, a) the number of zeros of f(x1)+⋯+f(xs) = a. In this paper, we show that 'Equation Presented' where 'Equation Presented' with Sf,m:= Σx∈FqζTr(mf(x))p, ζpbeing the p-th primitive unit root and Tr being the trace map from Fqto Fp. This extends Richman's theorem which treats the case of f(x) being a monomial. Moreover, we show that the generating series Σ∞s=1Ns(f, a)xsis a rational function in x and also present its explicit expression in terms of the first 2d + 1 initial values N1(f, a), ⋯,N2d+1(f, a), where d is a positive integer no more than q-1. From this result, the theorems of Chowla-Cowles-Cowles and of Myerson can be derived. Copyright © 2021, The Authors. All rights reserved.

关键词： Rational functions

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