检索结果-南通市图书馆

Nondegenerative ML-sequences over ring Z/(2~e)

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1999年第17期44卷 1557-1561页

作者： YANG Junhui and ZHAI QibinInstitute of Software , Chinese Academy of Sciences , Beijing 100080, China State key laboratory of information security , Beijing 100080, China Chinese Acad Sci Inst Software Beijing 100080 Peoples R China State key Lab Informat Secur Beijing 100080 Peoples R China

The so-called quasi-period of an ML-sequence has been introduced. It is noted that an ML-sequence may degenerate in the sense that it has the quasi-period shorter than its period, and the problem of constructing the n... 详细信息

关键词： nondegenerate ML-sequence quasi-period.

On an attack on RSA with small CRT-exponents

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(information Sciences) 2010年第8期53卷 1511-1518页

作者： HAN LiDong 1,2 , WANG XiaoYun 3 & XU GuangWu 3,4.1 key laboratory of Cryptologic technology and information {4., Ministry of Education, Shandong University, Jinan 250100, China 2 School of Mathematics, Shandong University, Jinan 250100, China 3 Institute for Advanced Study, Tsinghua University, Beijing 100084. China 4.Department of Electrical Engineering and Computer Science, University of Wisconsin-Milwaukee, Milwaukee, WI 53201, USA 1. key laboratory of Cryptologic technology and information {4. Ministry of Education Shandong University Jinan 250100 China2. School of Mathematics Shandong University Jinan 250100 China3. Institute for Advanced Study Tsinghua University Beijing 100084 China4. Department of Electrical Engineering and Computer Science University of Wisconsin-Milwaukee Milwaukee WI 53201 USA

This paper concerns the RSA system with private CRT-exponents. Since Chinese remainder representation provides efficiency in computation, such system is of some practical significance. In this paper, an existing attack to small private CRT-exponents is analyzed. It is indicated that this attack makes nice use of lattice in RSA analysis, but some argument does not hold in general. Several counterexamples are constructed. Refinements and more precise statements of the attack are given.

关键词： RSA CRT cryptanalysis continued fraction lattice reduction

A class of binary cyclic codes with five weights

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China Mathematics 2010年第12期53卷 3279-3286页

作者： LI ChunLei 1 , ZENG XiangYong 1, & HU Lei 2 1 Faculty of Mathematics and Computer Science, Hubei University, Wuhan 4.0062, China 2 The State key laboratory of information security, Graduate School of Chinese Academy of Sciences, Beijing 10004., China 1. Faculty of Mathematics and Computer Science Hubei University Wuhan 430062 China2. The State Key Laboratory of Information Security Graduate School of Chinese Academy of Sciences Beijing 100049 China

In this paper, the dual code of the binary cyclic code of length 2 n-1 with three zeros α, α t 1 and α t 2 is proven to have five nonzero Hamming weights in the case that n 4.is even and t1 = 2 n/2 + 1, t2 = 2 n-1-2 n/2+1 + 1 or 2 n/2 + 3, where α is a primitive element of the finite field F 2 n . The dual code is a divisible code of level n/2+1, and its weight distribution is also completely determined. When n = 4. the dual code satisfies Ward's bound.

关键词： cyclic code Niho exponent exponential sum Pless power moment identity weight distribution

A gain-flatness optimization solution for feedback technology of wideband low noise amplifiers

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science C(Computers and Electronics) 2011年第7期12卷 608-613页

作者： Zhen-hua LI,Bang-hong GUO,Zheng-jun WEI ,Song-hao LIU,Nan CHENG,Jin-dong WANG,Jian-jun GUO,Long YAN (key laboratory of Photonic information technology of {4. Higher Education Institutes,SIPSE & LQIT,South China Normal University,{4. 510006,China) key laboratory of Photonic information technology of {4. Higher Education Institutes SIPSE & LQIT South China Normal University

The S parameter expression of high-frequency models of the high electron mobility transistors (HEMTs) with basic feedback structure,especially the transmission gain S 21,is presented and *** addition,an improved feedback structure and its theory are proposed and demonstrated,in order to obtain a better gain-flatness through the mutual interaction between the series inductor and the parallel capacitor in the feedback *** optimization solution for the feedback amplifier can eliminate the negative impacts on transmission gain S 21 caused by things such as resonance ***,our theory covers the shortage of conventional feedback amplifiers,to some extent.A wideband low-noise amplifier (LNA) with the improved feedback tech-nology is designed based on *** transmission gain is about 20 dB with the gain variation of 1.2 dB from 100 MHz to 6 *** noise figure is lower than 2.8 dB in the whole band and the amplifier is unconditionally stable.

关键词： Low-noise amplifier (LNA) Ultra-wideband HEMT Feedback Gain flatness

RING PROXY SIGNATURES

在线全文

学校读者我要写书评

暂无评论

Journal of Electronics(China) 2008年第1期25卷 108-114页

作者： Wei Baodian Zhang Fangguo Chen Xiaofeng Department of Electronics and Communication Engineering Sun Yat-Sen University Guangzhou 510275 China Department of Computer Science Sun Yat-Sen University Guangzhou 510275 China guangdong.key laboratory of information {4. {4. Guangzhou 510275 China

Proxy signatures have been used to enable the transfer of digital signing power within some context and ring signatures can be used to provide the anonymity of a signer. By combining the functionalities of proxy signatures and ring signatures, this paper introduces a new concept, named ring proxy signature, which is a proxy signature generated by an anonymous member from a set of potential signers. The paper also constructs the first concrete ring proxy signature scheme based on the provably secure Schnorr's signatures and two ID-based ring proxy signature schemes. The security analysis is provided as well.

关键词： Proxy signature Ring signature Ring proxy signature ID-based cryptography Bilinear parings

Active constraints selection based semi-supervised dimensionality in ensemble subspaces

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2015年第5期26卷 1088-1099页

作者： Jie Zeng Wei Nie Yong Zhang College of information Engineering Shenzhen University Modern Communication and information Processing key laboratory Shenzhen University ATR key laboratory of National Defense technology Shenzhen University

Semi-supervised dimensionality reduction(SSDR) has attracted an increasing amount of attention in this big-data *** algorithms have been developed with a small number of pairwise constraints to achieve performances comparable to those of fully supervised methods. However, one challenging problem with semi-supervised approaches is the appropriate choice of the constraint set, including the cardinality and the composition of the constraint set, which to a large extent, affects the performance of the resulting algorithm. In this work, we address the problem by incorporating ensemble subspace and active learning into dimensionality reduction and propose a new algorithm, termed as global and local scatter based SSDR with active pairwise constraints selection in ensemble subspaces(SSGL-ESA). Unlike traditional methods that select the supervised information in one subspace,we pick up pairwise constraints in ensemble subspace, where a novel active learning algorithm is designed with both exploration and filtering to generate informative pairwise constraints. The automatic constraint selection approach proposed in this paper can be generalized to be used with all constraint-based semi-supervised learning algorithms. Comparative experiments are conducted on two face database and the results validate the effectiveness of the proposed method.

关键词： semi-supervised dimensionality reduction(SSDR) ensemble subspace active learning machine learning

The band structures of BSb and B_xGa_(1-x)Sb alloys

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2009年第6期52卷 843-847页

作者： XIONG DePing1, ZHOU ShouLi2, WANG Qi3, LUO Li1, HUANG YongQing3 & REN XiaoMin3 1 School of Physics and Optoelectronic Engineering, guangdong University of technology, guangzhou 510006, China 2 College of information Engineering, Zhejiang University of technology, Hangzhou 310032, China 3 key laboratory of Optical Communication and Lightwave Technologies Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China 1. School of Physics and Optoelectronic Engineering Guangdong University of Technology Guangzhou 510006 China 2. College of information Engineering Zhejiang University of Technology Hangzhou 310032 China 3. key laboratory of Optical Communication and Lightwave Technologies Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China

The band structures of BSb and BxGa1-xSb alloys are studied using first-principles calculations in the generalized gradient approximation. By SQS-8 supercells to model a random alloy, the direct transition energy-gap (Γ15v- Γ1c) bowing of 3.0 eV is obtained for BxGa1-xSb alloys in x = 0-50%, in x = 0-11% the energy-gap is the band-gap and increases by 7 meV/%B with boron composition increasing; by SQS-16 supercells the bowing parameter is about 1.9 eV in x = 0-12.5%. The formation enthalpies of mixing, ΔH, are calculated for BxGa1-xAs and BxGa1-xSb alloys. A comparison of enthalpies indicates that BxGa1-xSb films with boron composition of 7% may be possible.

关键词： band-gap bowing parameter boride alloys

Evolutionary cryptography theory based generating method for a secure Koblitz elliptic curve and its improvement by a hidden Markov models

在线全文

学校读者我要写书评

暂无评论

Science China(information Sciences) 2012年第4期55卷 911-920页

作者： WANG Chao 1,ZHANG HuanGuo 2,3 & LIU LiLi 4.1 key Lab of Specialty Fiber Optics and Optical Access Network,Ministry of Education,Shanghai University,Shanghai 200072,China 2 Computer School of Wuhan University,Wuhan 4.0072,China 3 key laboratory of Aerospace information {4. and Trusted Computing Ministry of Education,Wuhan 4.0072,China 4.Huawei Technologies CO.LTD.,Shanghai 201206,China 1. key Lab of Specialty Fiber Optics and Optical Access Network Ministry of Education Shanghai University Shanghai 200072 China2. Computer School of Wuhan University Wuhan 430072 China3. Key Laboratory of Aerospace Information Security and Trusted Computing Ministry of Education Wuhan 430072 China4. Huawei Technologies CO. LTD. Shanghai 201206 China

Considering potential attacks from cloud-computing and quantum-computing,it is becoming nec-essary to provide higher security elliptic *** hidden Markov models are introduced for designing the trace-vector computation algorithm to accelerate the search for elliptic curve (EC) *** present a new algorithm for secure Koblitz EC generation based on evolutionary cryptography *** algorithm is tested by selecting a secure Koblitz EC over the field F(2 2000),with experiments showing that both the base field and base point of the secure curve generated exceed the parameter range for Koblitz curves recommended by *** base fields generated go beyond 1900 bits,which is higher than the 571 bits recommended by *** also find new secure curves in the range F(2 163)-F(2 571) recommended by *** perform a detailed security analysis of those secure curves,showing that those we propose satisfy the same security criteria as NIST.

关键词： secure EC selection evolutionary cryptography theory ant colony algorithm Koblitz EC HMM

Round-optimal zero-knowledge proofs of knowledge for NP

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(information Sciences) 2012年第11期55卷 2473-2484页

作者： LI HongDa1,FENG DengGuo2,LI Bao1 & XUE HaiXia1 1State key Lab of information security,Graduate University of Chinese Academy of Sciences,Beijing 10004.,China 2State key Lab of information security,Institute of software of Chinese Academy of Sciences,Beijing 100080,China 1. State key Lab of information security Graduate University of Chinese Academy of Sciences Beijing 100049 China2. State Key Lab of Information Security Institute of software of Chinese Academy of Sciences Beijing 100080 China

It is well known that all the known black-box zero-knowledge proofs of knowledge for NP are *** there exit constant-round black-box zero-knowledge proofs of knowledge for all NP languages under certain standard assumptions is an open *** paper focuses on the problem and gives a positive answer by presenting two constructions of constant-round(black-box) zero-knowledge proofs of knowledge for the HC(hamiltonian cycle) *** the recent result of Katz,our second construction which relies on the existence of claw-free functions has optimal round complexity(5-round) assuming the polynomial hierarchy does not collapse.

关键词： zero-knowledge proofs proofs of knowledge black-box simulation constant-round