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Paillier's trapdoor function hides Θ(n) bits

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Science china(information Sciences) 2011年第9期54卷 1827-1836页

作者： SU Dong & Lü KeWei state key laboratory of information security,Graduate University of Chinese Academy of Sciences,beij.ng 100049,china 1. state key laboratory of information security Graduate University of Chinese Academy of Sciences Beijing 100049 China

In this paper,we re-examine the bit security of Paillier’s trapdoor *** show that given a random w=gcyN mod N2 ∈ZN2* the most significant bit of its class c is a hard-core predicate,under a standard assumption that is computing composite residuosity class is *** the simultaneous security,we prove that n number of the class c’s bits are simultaneously hard-core under the standard assumption,where n is the length of c.

关键词： Paillier’s trapdoor function hard-core predicate hard-core function simultaneous security most significant bit

CMQV+:An authenticated key exchange protocol from CMQV

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Science china(information Sciences) 2012年第7期55卷 1666-1674页

作者： LI Hui 1,2 & WU ChuanKun 1 1 state key laboratory of information security,Institute of Software,Chinese Academy of Sciences,beij.ng 100190,china 2 Graduate University of Chinese Academy of Sciences,beij.ng 100049,china 1. state key laboratory of information security Institute of Software Chinese Academy of Sciences Beijing 100190 China2. Graduate University of Chinese Academy of Sciences Beijing 100049 China

Ustaoglu presents a secure and efficient key exchange protocol named CMQV,based on the design rationales of HMQV and *** with the latter two protocols,on one hand,CMQV achieves high performance of HMQV,and on the other,it is proven secure in eCK model as NAXOS ***,CMQV enjoys the security proof under gap Diffie-Hellman assumption as indicated by its *** this paper,we propose a variant of CMQV,called CMQV+,which is proven secure under a weaker assumption (*** Diffie-Hellman assumption) in eCK model with random oracles while maintaining the high-performance feature of CMQV as much as possible.

关键词： key exchange eCK model trapdoor-test technique provable security CDH assumption

A two-round honest-verifier zero-knowledge protocol

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Science china(information Sciences) 2010年第5期53卷 954-963页

作者： LIU HanWu 1,2 & LIN DongDai 1 1 The state key laboratory of information security, Institute of Software, Chinese Academy of Sciences, beij.ng 100190, china 2 Graduate University of the Chinese Academy of Sciences, beij.ng 100049, china 1. The state key laboratory of information security Institute of Software Chinese Academy of Sciences Beijing 100190 China2. Graduate University of the Chinese Academy of Sciences Beijing 100049 China

Since the concept of zero-knowledge protocols was introduced, it has attracted a lot of attention and in turn showed significant effect on the development of cryptography, complexity theory and other areas. The round complexity of a zero-knowledge protocol is a very important efficiency consideration, and it is required to be as small as possible. Generally, it is desirable to have zero-knowledge protocols with constant numbers of rounds. Goldreich and Oren proved that only languages in BPP have one-round and two-round zero-knowledge protocols. Moreover, they also showed that only languages in BPP have one-round honest-verifier zero-knowledge protocols. The notion of honest-verifier zero-knowledge protocols is highly non-trivial and fascinating itself, and has many other uses. Thus, the problem as to whether there exist two-round honest-verifier zero-knowledge protocols becomes an important open problem. In this paper, we introduce a new simulation technique and present a two-round honest-verifier zero-knowledge protocol for any language in N P under a standard complexity assumption based on this technique.

关键词： proof system argument system zero-knowledge witness indistinguishability black-box one-way permutation commitment scheme zap

Calculation of maximum ground movement and deformation caused by mining

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中国有色金属学会会刊：英文版 2011年第S3期21卷 562-569页

作者： LI Pei-xian1, 2, TAN Zhi-xiang1, 2, DEng Ka-zhong1, 2 1. key laboratory for Land Environment and Disaster Monitoring of state Bureau of Surveying and Mapping, china University of Mining and Technology, Xuzhou 221116, china 2. Jiangsu key laboratory of Resources and Environmental information Engineering, china University of Mining and Technology, Xuzhou 221116, china [a] key laboratory for Land Environment and Disaster Monitoring of state Bureau of Surveying and Mapping China University of Mining and Technology Xuzhou 221116 China [b] Jiangsu key laboratory of Resources and Environmental information Engineering China University of Mining and Technology Xuzhou 221116 China

In order to know the maximum mining ground deformation of arbitrary surface point, directions of the maximum surface tilt, curvature,horizontal displacement and horizontal deformation caused by multi-working faces were deduced based on probability integral method. The distribution forms of surface deformations in all direction φ∈[0, 2π] were obtained and also equations of maximum deformations were given based on calculation of mining ground deformation in direction φ. A mining subsidence analysis system was developed with VB6.0. The system implements the probability integral mining subsidence prediction with direct integration method, and it can avoid errors of arbitrary shaped working face subdivision of traditional method, and accuracy of mining subsidence prediction can be improved with the direct integral method. The system implements the contour chart and profile chart and also data analysis automation by manipulation of the SURFER kernel function and it complements the defect of existing subsidence prediction software. Calculation of maximum deformations caused by multi-working faces mining in a coal mine of Xuzhou, china was shown as application example. Engineering application indicates that maximum deformation of mining ground surface can be calculated and analyzed by the system. The research provides a theoretical basis and calculation tool for mining subsidence prediction and analysis.

关键词： mining subsidence probability integral method movement and deformation system development

Secure multi-party computation protocol for sequencing problem

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Science china(information Sciences) 2011年第8期54卷 1654-1662页

作者： TAng ChunMing 1,2,SHI GuiHua 1 & YAO ZhengAn 3 1 School of Mathematics and information Science,Guangzhou University,Guangzhou 510006, china 2state key laboratory of information security, Institute of Software Science,Chinese Academy of Sciences,beij.ng 100080,china 3 School of Mathematics and Computational Science,Sun Yat-Sen University,Guangzhou 510275,china 1. School of Mathematics and information Science Guangzhou University Guangzhou 510006 China2. State Key Laboratory of Information Security Institute of Software Science Chinese Academy of Sciences Beijing 100080 China3. School of Mathematics and Computational Science Sun Yat-Sen University Guangzhou 510275 China

In the field of multi-party computation,an important problem is how to construct an efficient and secure multi-party computation protocol for certain specific *** the present study,we make use of a secret sharing scheme to construct an efficient and secure multi-party computation protocol for sequencing *** protocols are perfectly secure against both a passive adversary that can corrupt at most t (n-1)/2 participants, and an active adversary that can corrupt at most t ng problem is the Millionaires' problem.

关键词： secure multi-party computation sequencing problem secret sharing

A new one-bit diFFerence collision attack on HAVAL-128

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Science china(information Sciences) 2012年第11期55卷 2521-2529页

作者： ZHAng WenYing1,2,3,LI YanYan1 & WU Lei1 1School of information Science and Engineering,Shandong Normal University,Jinan 250014,china 2state key Lab of information security,Institute of information Engineering,Chinese Academy of Sciences,beij.ng 100093,china 3Shandong Provincial key laboratory for Novel Distributed Computer Software Technology,Jinan 250014,china 1. School of information Science and Engineering Shandong Normal University Jinan 250014 China2. State Key Lab of Information Security Institute of Information Engineering Chinese Academy of Sciences Beijing 100093 China3. Shandong Provincial Key Laboratory for Novel Distributed Computer Software Technology Jinan 250014 China

In this paper,we give a new fast attack on *** attack includes many present methods of constructing hash ***,we present a neighborhood *** propose a new difference path different from the previous *** conclusion is that,when the output of each step satisfies our condition,the message m can collide with m'= m + Δm,where Δm =(0,0,0,0,231,0,...,0).There is only one bit difference between m and m'.Two pairs of collision examples for HAVAL-128 are *** order to improve the probability of collision,we use four tricks of message *** attack's running time is less than 225.83 2-pass HAVAL computations,which is the best result for one-bit collision of HAVAL so far.

关键词： cryptography hash function HAVAL-128 collision message modification

New application methods for word-oriented cryptographic primitives

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Science china(information Sciences) 2012年第9期55卷 2149-2160页

作者： YAng Yang 1,2,ZEng Guang 1,2,JIN ChengHui 1 & QU YunYing 1 1 Zhengzhou information Science and Technology Institute,Zhengzhou 450002,china 2 state key laboratory of information security,Institute of Software,Chinese Academy of Sciences,beij.ng 100190,china 1. Zhengzhou information Science and Technology Institute Zhengzhou 450002 China2. State Key Laboratory of Information Security Institute of Software Chinese Academy of Sciences Beijing 100190 China

Modern software oriented symmetric ciphers have become a key feature in utilizing word-oriented cryptographic *** the output sequence,in the order of its generation,of a word-oriented cryptographic primitive in the same way as traditional bit-oriented primitives,we can expose the intrinsic weakness of these primitives,especially for word-oriented linear feedback shift registers,T-functions,and so *** new methods for using word-oriented cryptographic primitives are presented in this paper,that is,the extracted state method and cascading extracted coordinate *** a T-function as an example,we research the different cryptographic properties of the output sequences of the original method and the two proposed methods,focusing mainly on period,linear complexity,and k-error linear *** conclusions show that the proposed methods could enhance at low cost the cryptographic properties of the output *** a result,since the new methods are simple and easy to implement,they could be used to design new word-oriented cryptographic primitives.

关键词： stream cipher single cycle T-function linear complexity k-error linear complexity

A new relative radiometric consistency processing method for change detection based on wavelet transform and a low-pass filter

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Science china(Technological Sciences) 2010年第S1期53卷 7-14页

作者： SUN KaiMin1,SUI HaiGang1,2,LI DeRen1 & XU Chuan1,2 1 state key laboratory of information Engineering in Surveying,Mapping and Remote Sensing,Wuhan University,Wuhan 430079,china 2 state key laboratory of Subtropical Building Science,South china University of Technology,Guangzhou 510640,china 1. state key laboratory of information Engineering in Surveying Mapping and Remote Sensing Wuhan University Wuhan 430079 China 2. state key laboratory of Subtropical Building Science South China University of Technology Guangzhou 510640 China

The research purpose of this paper is to show the limitations of the existing radiometric normalization approaches and their disadvantages in change detection of artificial objects by comparing the existing approaches,on the basis of which a preprocessing approach to radiometric consistency,based on wavelet transform and a spatial low-pass filter,has been *** approach first separates the high frequency information and low frequency information by wavelet ***,the processing of relative radiometric consistency based on a low-pass filter is conducted on the low frequency *** processing,an inverse wavelet transform is conducted to obtain the results *** experimental results show that this approach can substantially reduce the influence on change detection of linear or nonlinear radiometric differences in multi-temporal images.

关键词： wavelet transform radiometric normalization low-pass filter change detection

SOME RESULTS ON GENERALIZED DIFFERENCE SETS

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Journal of Systems Science & Complexity 2008年第1期21卷 76-84页

作者： Xiwang CAO School of Mathematical Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, china state key Lab. of information security, beij.ng 100049, china. School of Mathematical Science Nanjing University of Aeronautics Astronautics Nanjing 210016 China state key Lab. of information security Beijing 100049 China

Sequences with ideal correlation functions have important applications in communications such as CDMA, FDMA, etc. It has been shown that difference sets can be used to construct such sequences. The author extends Pott and Bradley＇s method to a much broader case by proposing the concept of generalized difference sets. Some necessary conditions for the existence of generalized difference sets are established by means of some Diophantine equations. The author also provides an algorithm to determine the existence of generalized difference sets in the cyclic group Zv. Some examples are presented to illustrate that our method works.

关键词： Correlation functions diophantine equations generalized difference sets.