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Polar differential power attacks and evaluation

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science China(Information sciences) 2012年第7期55卷 1588-1604页

作者： TANG Ming 1 ,QIU ZhenLong 1 ,GAO Si 1,2 ,YI Mu 3 ,LIU ShuBo 1 ,ZHANG HuanGuo 1 & JIN YingZhen 1 1 School of computer science,Wuhan university,Wuhan 430072,China 2 State Key Laboratory of Information Security,Institute of software,Chinese Academy of sciences,Beijing 100190,China 3 Centre for computer and Information Security Research School of computer science and software engineering university of Wollongong,Wollongong,NSW 2522,australia 1. School of computer science Wuhan University Wuhan 430072 China2. State Key Laboratory of Information Security Institute of Software Chinese Academy of Sciences Beijing 100190 China3. Centre for Computer and Information Security Research School of Computer Science and Software Engineering University of Wollongong Wollongong NSW 2522 Australia

Side channel attacks (SCAs) on security software and hardware have become major concerns on computer and system *** existing SCAs generally require the knowledge of the corresponding cryptographic algorithm and implementation adopted in the target; therefore,they are not fully suitable for practical *** this paper,we propose a novel SCA-polar differential power attack (polar DPA).We found that DPA peaks have different biases for different cryptographic algorithms and *** on these biases,we can successfully attack a block cipher,assuming that the cipher algorithm uses a secret key in its first round,without the knowledge of the cipher algorithm or *** rounds can be treated as a black *** present a detailed theoretical analysis and experiment to demonstrate the correctness and efficiency of our ***,our scheme has demonstrated an improvement over the leakage evaluation scheme due to Ichikawa et al.(CHES 2005).Our evaluation method can be used in electronic design automatic (EDA) flows and can help security circuit designers to understand the data leakage due to SCAs.

关键词： computer security differential power attack side channel attack

A particle-based method for granular flow simulation

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science China(Information sciences) 2012年第5期55卷 1062-1072页

作者： CHANG YuanZhang 1,BAO Kai 2,3,ZHU Jian 1 & WU EnHua 1,2 1 department of computer and Information science,university of Macau,Macao,China 2 State Key Laboratory of computer science,Institute of software,Chinese Academy of sciences,Beijing 100190,China 3 Division of Mathematical and computer sciences & engineering,KAUST,Thuwal,Saudi Arabia 1. department of computer and Information science University of Macau Macao China2. State Key Laboratory of Computer Science Institute of Software Chinese Academy of Sciences Beijing 100190 China3. Division of Mathematical and Computer Sciences & Engineering KAUST Thuwal Saudi Arabia

We present a new particle-based method for granular flow *** the method,a new elastic stress term,which is derived from a modified form of the Hooke's law,is included in the momentum governing equation to handle the friction of granular *** force is also added to simulate the dynamic friction for the purpose of smoothing the velocity field and further maintaining the simulation *** from the Lagrangian nature of the SPH method,large flow deformation can be well handled easily and *** addition,a signed distance field is also employed to enforce the solid boundary *** experimental results show that the proposed method is effective and efficient for handling the flow of granular materials,and different kinds of granular behaviors can be well simulated by adjusting just one parameter.

关键词： granular materials sand smoothed particle hydrodynamics SPH Hooke’s law animation simu-lation

Asymptotic SEP of MIMO beamforming in two-hop AF relaying systems

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science China(Information sciences) 2012年第2期55卷 377-383页

作者： FU YouHua1,HAN YuJie2,YANG LvXi2,ZHU WeiPing3 & LIU Chen1 1School of Electronic science and engineering,Nanjing university of Posts and Telecommunications,Nanjing 210003,China 2School of Information science and engineering,Southeast university,Nanjing 210096,China 3department of Electrical and computer engineering,Concordia university,Montreal H3G 1M8,Canada 1. School of Electronic science and engineering Nanjing University of Posts and Telecommunications Nanjing 210003 China2. School of Information Science and Engineering Southeast University Nanjing 210096 China3. Department of Electrical and Computer Engineering Concordia University Montreal H3G 1M8 Canada

This paper derives an asymptotic average symbol error probability(SEP)expression for multiple-input multiple-output(MIMO)two-hop amplify-and-forward(AF)relay systems with optimal *** analysis at high signal-to-noise ratio(SNR)quantifies the diversity order and array gain,which are valid for any antenna numbers of the terminals and arbitrary channel fading *** is also proved that the system performance is dominated by the relatively degraded one of the two-hop *** results based on the simple expressions provide valuable insights into the performance and practical design considerations of MIMO AF networks.

关键词： MIMO relay networks optimal beamforming symbol error probability(SEP) diversity order

Kernel model-based diagnosis

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Progress in Natural science:Materials International 2002年第2期12卷 63-67页

作者： OUYANG Dantong(department of computer science, Jilin university, Changchun 130012, China) Jilin Univ Dept Comp Sci Changchun 130012 Peoples R China

The methods for computing the kernel consistency-based diagnoses and the kernel abductive diagnoses are only suited for the situation where part of the fault behavioral modes of the components are known. The characterization of the kernel model-based diagnosis based on the general causal theory is proposed, which can break through the limitation of the above methods when all behavioral modes of each component are known. Using this method, when observation subsets deduced logically are respectively assigned to the empty or the whole observation set, the kernel consistency-based diagnoses and the kernel abductive diagnoses can deal with all situations. The direct relationship between this diagnostic procedure and the prime implicants/implicates is proved, thus linking theoretical result with implementation.

关键词： model-based diagnosis general causal theory prime implicant/implicate diagnostic space.

SYMPLECTIC SCHEMES FOR QUASILINEAR WAVE EQUATIONS OF KLEIN-GORDON AND SINE-GORDON TYPE

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Journal of Computational Mathematics 2001年第5期19卷 475-488页

作者： Xiao-wu Lu (department of Mathematics and computer science, Emory university, Atlanta, GA 30322, USA) Emory university 美国 30322

Presents a class of finite difference methods of first and second order accuracy for the computation of solutions to the quasilinear wave equations. Overview of general symplectic schemes and generating functional; Nu... 详细信息

关键词： Symplectic integration Sine-Gordon equations Finite difference method.

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R-calculus without the cut rule

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science China(Information sciences) 2011年第12期54卷 2550-2563页

作者： LUO Jie & LI Wei State Key Laboratory of software Development Environment, School of computer science and engineering, Beihang university, Beijing 100191, China 1. State Key Laboratory of software Development Environment School of Computer Science and Engineering Beihang University Beijing 100191 China

R-calculus is an inference system for deducing all possible changes when a theory is refuted by the facts. In this paper, we try to eliminate the cut rule in R-calculus by modifying the existing rules and by introducing new rules. The result is the R-calculus without the cut rule, which still preserves the reachability, soundness and completeness as R-calculus does. R-calculus without the cut rule is a formal inference system of logical connective symbols and quantifier symbols solely. It can serve as the theoretical foundation of the automation of revision calculus.

关键词： revision R-calculus cut rule

MATRIX ANALYSIS ON LEADING TERM OF CONDITION NUMBER FOR ADDITIVE SCHWARZ METHODS

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Journal of Computational Mathematics 2001年第2期19卷 157-166页

作者： Jia-chang Sun (R & D Center of Paraller software, Laboratory for computer science, Institute of software, Chinese Academy of sciences) 中科院软件所

It is well known the order of preconditioned matrix by using additive Schwarz methods. In order to estimate the resulted PCG iteration counts, the related leading term brfore the order is given in this paper.

关键词： additive Schwarz method PCG matrix analysis

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Low complexity construction for quasi-cyclic low-density parity-check codes by Progressive-Block Growth

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science China(Information sciences) 2011年第2期54卷 371-380页

作者： REN PinYi1, YUAN Qiang2, WANG Rui1 & CAI Jun3 1School of Electronic engineering, Xi’an Jiaotong university, Xi’an 710049, China 2Wuhan Ordnance Noncommissioned Officers Academy, Wuhan 430075, China 3department of Electrical & computer engineering, university of Manitoba, Winnipeg, Manitoba R3T 5V6, Canada 1. School of Electronic engineering Xi’an Jiaotong University Xi’an 710049 China2. Wuhan Ordnance Noncommissioned Officers Academy Wuhan 430075 China3. Department of Electrical & Computer Engineering University of Manitoba Winnipeg Manitoba R3T 5V6 Canada

In this paper, a novel method for constructing quasi-cyclic LDPC codes with low complexity is proposed. By choosing each circulant permutation matrix sequentially, the proposed method ensures that the current circulant permutation matrix forms no cycles of length smaller than g with the existent circulant permutation matrices. The construction complexity of the proposed algorithm is much lower than that of the random construction. Simulation results show that the proposed QC-LDPC codes can outperform both the random regular LDPC codes with short to moderate block lengths, and the proposed construction method LDPC codes based on the finite geometries in terms of bit-error-rate (BER).

关键词： quasi-cyclic (QC) LDPC (low-density parity-check) codes circulant permutation matrix girth

computer System Reliability Allocation Method and Supporting Tool

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Wuhan university Journal of Natural sciences 2001年第Z1期6卷 505-510页

作者： Ben Ke\|rong 1, Yan Jiong 2, Wang Ji 2 1 department of computer science, Naval university of engineering, Wuhan 430033, China software engineering Key Lab.,Wuhan university,Wuhan 430072, China 2 department of computer science, National Universit department of computer science Naval University of Engineering Wuhan China software engineering Key Lab. Wuhan University Wuhan China department of computer science National University of Defence Technology Changsha China

This paper presents a computer system reliability allocation method that is based on the theory of statistic and Markovian chain,which can be used to allocate reliability to subsystem, to hybrid system and software mo... 详细信息

关键词： software Reliability reliability allocation method supporting tool

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