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Capability of evolutionary cryptosystems against differential cryptanalysis

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Science China(information Sciences) 2011年第10期54卷 1991-2000页

作者： ZHANG HuanGuo 1,2.,LI ChunLei 1,2.& TANG Ming 1,2.1 School of Computer,wuhan university,wuhan 430072.China 2.key laboratory of aerospace information security and trusted computing of ministry of education,wuhan university,wuhan 430072.China School of Computer Wuhan University Wuhan China key laboratory of {2. {2. security and trusted computing of ministry of education Wuhan University Wuhan China

The evolutionary cryptosystem is a new *** paper studies its security level resisting against differential *** is shown that the evolutionary cryptosystem possesses higher resistance than its initial fixed cryptosystem against differential *** the basis of the relationship among the data complexity,the bit advantage and the success rate of differential cryptanalysis,it is proven that more data is needed for attacking the evolutionary cryptosystem when the bit advantage and success rate are ***,it is shown that the time complexity for attacking the evolutionary cryptosystem is higher than that of differential attacking its initial fixed cryptosystem with the same amount of plaintext-ciphertext *** research indicates that the evolutionary cryptosystem is more robust than its initial fixed cryptosystem against differential cryptanalysis.

关键词： information security cryptology evolutionary cryptosystem cryptanalysis differential cryptanalysis

Extended multivariate public key cryptosystems with secure encryption function

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Science China(information Sciences) 2011年第6期54卷 1161-1171页

作者： WANG HouZhen 1,2., ZHANG HuanGuo 1,2., WANG ZhangYi 1,2.& TANG Ming 1,2.1 The key laboratory of {2. {2. security and trusted computing, ministry of education, School of Computer, wuhan university, wuhan 430079, China 2.State key laboratory of Software Engineering, wuhan university, wuhan 430072. China The key laboratory of {2. {2. security and trusted computing Ministry of Education School of Computer Wuhan University Wuhan China State key laboratory of Software Engineering Wuhan University Wuhan China

Advances in quantum computers pose great threats on the currently used public key cryptographic algorithms such as RSA and ECC. As a promising candidate secure against attackers equipped with quantum computational power, multivariate public key cryptosystems (MPKCs) have attracted increasing attention in recently years. Unfortunately, the existing MPKCs can only be used as a multivariate signature scheme, and it remains unknown how to construct an efficient MPKC enabling secure encryption. Furthermore, some multivariate signature schemes have been shown insecure in recent years, and it is also not trivial to build MPKC which can serve as a secure signature scheme. By employing the basic MQ-trapdoors, this paper proposes a novel MPKC and shows how it can be used as a multivariate signature scheme and a multivariate encryption scheme, respectively. The goal is achieved by incorporating our new hash authentication techniques and some modification methods such as the Shamir's minus method. Thorough analysis shows that our schemes are secure and efficient. Our MPKC gives a positive response to the challenges in multivariate public key cryptography.

关键词： cryptography post-quantum cryptography MQ problem hash function

A new perturbation algorithm and enhancing security of SFLASH signature scheme

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Science China(information Sciences) 2010年第4期53卷 760-768页

作者： WANG HouZhen1,2. ZHANG HuanGuo1,2., GUAN HaiMing3 & HAN HaiQing1,2.1The key laboratory of {2. {2. security and trusted computing, ministry of education, wuhan university, wuhan 430072. China 2.chool of Computer, wuhan university,{12., China 3Chinese Electronic Equipment System Corporation, Beijing 100039, China The key laboratory of {2. {2. security and trusted computing Ministry of Education Wuhan University Wuhan China School of Computer Wuhan University Wuhan China Chinese Electronic Equipment System Corporation Beijing China

This paper introduces the concept of noise factor and noise operation, and constructs a noise group. We present a new perturbation algorithm for enhancing security of multivariate public key cryptosystems (MPKCs). European Consortium SFLASH which derives from Matsumoto-Imai scheme is a fast signature scheme intended for low cost smart cards. It was broken with the differential cryptanalysis by Dubois et al. in 2.07. Taking Matsumoto-Imai system as an example, security analysis shows that the new algorithm can powerfully demolish its potential mathematical properties of the public key, and effectively avoid differential cryptanalysis without lowering the effciency of the original algorithm.

关键词： SFLASH differential cryptanalysis noise factor noise operation noise group

Research on theory and key technology of trusted {2. platform {2. testing and evaluation

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Science China(information Sciences) 2010年第3期53卷 434-453页

作者： ZHANG HuanGuo1,2. YAN Fei1,2. FU JianMing1,2. XU MingDi1,2. YANG Yang1,2. HE Fan1,2.& ZHAN Jing1,2.1School of Computer, wuhan university, wuhan 430072. China 2.2. {2. of aerospace information security and trusted computing, ministry of education, wuhan 430072. China School of Computer Wuhan University Wuhan China key laboratory of {2. {2. security and trusted computing Ministry of Education Wuhan China

trusted computing has become a new trend in the area of international{2. security, and the products of trusted computing platform begin to be used in application. Users will not use the products of{2. security, unless it goes through the testing and evaluation. Here we concentrate on the testing and evaluation problem of trusted computing platform, begin with constructing proper formalization model of trusted computing platform for testing, and establish a mathematical chain of trust model based on SPA. Moreover, we give a verification method of composite characteristics and find the potential factors threatening the trusted system in the process of remote attestation through analysis. For trusted software stack, we study the problem of automatic generation of test case and propose an improved method of generating the random test case, to raise the quality of test case. Finally, we give a prototype system of trusted computing platform and the actual test data related. The result demonstrates that there exist some flaws in the architecture of the present TCG computing platform. At the same time, some flaws are found in the products of existing trusted computing platform, thus a basis is laid for the improvement and development of trusted platform technology and its products.

关键词： information security trusted computing trusted computing platform testing and evaluation

A Fast Pseudorandom Number Generator with BLAKE Hash Function

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wuhan university Journal of Natural Sciences 2010年第5期15卷 393-397页

作者： WANG Houzhen1,2.ZHANG Huanguo1,2.1.key laboratory of {2. {2. security and trusted computing of ministry of education,wuhan university,wuhan 430072.Hubei,China 2.School of Computer,wuhan university,wuhan 430072.Hubei,China key laboratory of {2. {2. security and trusted computing of ministry of education Wuhan University Wuhan Hubei China School of Computer Wuhan University Wuhan Hubei China

This paper presents a fast pseudorandom generation algorithm,which is based on the BLAKE hash function and can pass the random test of the NIST（National Institute of Standards and Technology） Statistical Test *** theoretical analysis and experimental imitation,our new algorithm is proven to be more secure and efficient than ***,we introduce and discuss the BLAKE in *** security shows that can be utilized to generate pseudorandom bit sequences,which the experimental results show the BLAKE hash function has excellent ***,we believe the BLAKE is one of the most potential candidate algorithms of SHA-3 program.

关键词： cryptography pseudorandom number generator hash function National Institute of Standards and Technology Statistical Test Suite

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Design theory and method of multivariate hash function

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Science China(information Sciences) 2010年第10期53卷 1977-1987页

作者： WANG HouZhen 1,2., ZHANG HuanGuo 1 , WU QianHong 1 , ZHANG Yu 1 , LI ChunLei 1 & ZHANG XinYu 1 1 The key laboratory of {2. {2. security and trusted computing, ministry of education, School of Computer, wuhan university, wuhan 430072. China 2.key laboratory of Mathematics Mechanization, Beijing 100080, China The key laboratory of {2. {2. security and trusted computing Ministry of Education School of Computer Wuhan University Wuhan China key laboratory of Mathematics Mechanization Beijing China

This paper proposes a novel hash algorithm whose security is based on the multivariate nonlinear polynomial equations of NP-hard problem over a finite field and combines with HAIFA iterative framework. Over the current widely used hash algorithms, the new algorithm has the following advantages: its security is based on a recognized difficult mathematical problem; the hash length can be changed freely; its design can be automated such that users may construct specific hash function meeting the actual needs. Furthermore, we discuss the security, efficiency and performance of the new algorithm. Under some related difficult mathematical assumptions and theoretical analysis, the new algorithm is proven practical by the experiment results, and capable of achieving security of an ideal hash function by choosing suitable parameters. In addition, it can also be used as a pseudo-random number generator for the good randomness of its output.

关键词： cryptology hash function MQ problem multivariate polynomials

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

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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 {2.,Shanghai {2.,Shanghai 2.0072.China 2.Computer School of wuhan university,wuhan 430072.China 3 key laboratory of aerospace information security and trusted {12. ministry of {2.,wuhan 430072.China 4 Huawei Technologies CO.LTD.,Shanghai 2.12.6,China key Lab of Specialty Fiber Optics and Optical Access Network Ministry of Education Shanghai University Shanghai China Computer School of wuhan university Wuhan China key laboratory of {2. {2. security and trusted computing ministry of education Wuhan China Huawei Technologies CO. LTD. Shanghai China

Considering potential attacks from cloud-computing and quantum-computing,it is becoming nec-essary to provide higher{2. 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(2.2.00),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{2. analysis of those secure curves,showing that those we propose satisfy the same{2. criteria as NIST.

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

A trusted Environment Construction Method for security-Sensitive Software

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wuhan university Journal of Natural Sciences 2011年第5期16卷 383-390页

作者： LI Jing1,2.ZHANG Huanguo1,2.ZHAO Bo1,2.FANG Lingling1,2.1.School of Computer,wuhan university,wuhan 430072.Hubei,China 2.key laboratory of aerospace information security and Trust computing,ministry of education,wuhan 430072.Hubei,China School of Computer Wuhan University Wuhan Hubei China key laboratory of {2. {2. security and Trust computing Ministry of Education Wuhan Hubei China

This paper presents a trusted-environment construction method based on the underlying hardware. This method aims at protecting the security-sensitive software in the aspects of software loading, running, and storing in the general operating system. It extends the trust chain of the traditional trusted computing technology to reach the target software, ensuring trusted loading. The extended memory management mechanism effectively pre- vents memory dumping and memory tampering for the high-sensitivity data. The file monitoring mechanism protects files from vicious operation made by attackers. Flexible-expanded storage environment provides the target software with static storing protection. Experimental system verifies that the method is suitable for general operating system and can effectively protect security-sensitive software with low overhead.

关键词： information security trusted computing securitysensitive software trusted environment

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Research on trusted computing and its development

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Science China(information Sciences) 2010年第3期53卷 405-433页

作者： SHEN ChangXiang1, ZHANG HuanGuo1?, WANG HuaiMin3, WANG Ji3, ZHAO Bo2. YAN Fei2. YU FaJiang2. ZHANG LiQiang2.& XU MingDi2.Beijing university of Technology, Beijing 10012., China 2.chool of Computer, wuhan university, {2. {2. of aerospace information security and trusted computing of ministry of education, wuhan 430072. China 3School of Computer, National university of Defence Technology, Changsha 430074, China Beijing university of Technology Beijing China School of Computer National University of Defence Technology Changsha China key laboratory of {2. {2. security and trusted computing of ministry of education School of Computer Wuhan University Wuhan China

trusted computing is a novel technology of{2. system security. It has become a new tide in worldwide{2. security area and achieved inspiring accomplishment. In China, the initiative research of trusted computing is not late, and the achievements are plentiful and substantial. Our country is in the front rank of the world in trusted computing. This paper comprehensively illustrates the recent development in theory and technology of trusted computing, introduces some improvements in trusted computing in our country, and proposes our opinions and viewpoints towards the existing problems in trusted computing and its future development.

关键词： information security trusted computing trusted computing platform trustworthy software trusted network connection