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An ID-based authenticated dynamic group key agreement with optimal round

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Science china(information sciences) 2012年第11期55卷 2542-2554页

作者： TENG JiKai1,2,WU ChuanKun1 & TANG ChunMing3 1state key laboratory of information security,Institute of Software of chinese academy of sciences,beijing 100090,china 2graduate university of chinese academy of sciences,beijing 100049,china 3Faculty of Mathematic and information Science,Guangzhou university,Guangzhou 510006,china state key laboratory of information security Institute of Software of Chinese Academy of Sciences Beijing China graduate university of chinese academy of sciences Beijing China Faculty of Mathematic and information Science Guangzhou University Guangzhou China

Group key agreement protocols are crucial for achieving secure group *** are designed to provide a set of users with a shared secret key to achieve cryptographic goal over a public *** group membership changes,the session key should be refreshed efficiently and *** previous group key agreement protocols need at least two rounds to establish or refresh session *** this paper,a dynamic authenticated group key agreement(DAGKA) protocol based on identity-based cryptography is *** making use of the members' values stored in previous sessions,our Join and Leave algorithms reduce the computation and communication costs of *** the proposed protocol,Setup and Join algorithms need one *** session key can be refreshed without message exchange among remaining users in Leave algorithm,which makes the protocol more *** security is proved under decisional bilinear Diffie-Hellman(DBDH) assumption in random oracle model.

关键词： identity-based cryptography dynamic group key agreement provably secure admissible pairing

Power functions with low uniformity on odd characteristic finite fields

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Science china Mathematics 2010年第8期53卷 1931-1940页

作者： ZHA ZhengBang 1,3 & WANG XueLi 2 1 School of Mathematical sciences,Luoyang Normal university,Luoyang 471022,china 2 School of Mathematical sciences,South china Normal university,Guangzhou 510631,china 3 state key laboratory of information security,graduate university of chinese academy of sciences,beijing 100049,china School of Mathematical sciences Luoyang Normal University Luoyang China state key laboratory of information security Graduate University of Chinese Academy of Sciences Beijing China School of Mathematical sciences South China Normal University Guangzhou China

In this paper,we give some new low differential uniformity of some power functions defined on finite fields with odd *** corollaries of the uniformity,we obtain two families of almost perfect nonlinear functions in GF... 详细信息

关键词： almost perfect nonlinear function differential uniform function finite field

On designated-weight Boolean functions with highest algebraic immunity

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Science china Mathematics 2010年第11期53卷 2847-2854页

作者： LIU MeiCheng1,3, DU YuSong2, PEI DingYi2 & LIN DongDai1 1The state key laboratory of information security, Institute of Software of chinese academy of sciences, beijing 100190, china 2College of Mathematics and information sciences, Guangzhou university, Guangzhou 510006, china 3graduate university of chinese academy of sciences, beijing 100049, china The state key laboratory of information security Institute of Software of Chinese Academy of Sciences Beijing China graduate university of chinese academy of sciences Beijing China College of Mathematics and information sciences Guangzhou University Guangzhou China

Algebraic immunity has been considered as one of cryptographically significant properties for Boolean functions. In this paper, we study ∑d-1 i=0 (ni)-weight Boolean functions with algebraic immunity achiev-ing the minimum of d and n - d + 1, which is highest for the functions. We present a simpler sufficient and necessary condition for these functions to achieve highest algebraic immunity. In addition, we prove that their algebraic degrees are not less than the maximum of d and n - d + 1, and for d = n1 +2 their nonlinearities equalthe minimum of ∑d-1 i=0 (ni) and ∑ d-1 i=0 (ni). Lastly, we identify two classes of such functions, one having algebraic degree of n or n-1.

关键词： cryptography Boolean function algebraic immunity algebraic degree nonlinearity

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

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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.

An efficient quantum secret sharing protocol with orthogonal product states

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Science china(Physics,Mechanics & Astronomy) 2007年第3期50卷 331-338页

作者： YANG YuGuang1,2, WEN QiaoYan3 & ZHU FuChen4 1 School of Computer, beijing university of Technology, beijing 100022, china 2.state key laboratory of information security, graduate university of chinese academy of sciences, beijing 100022, china 3 School of Science, beijing university of Posts and Telecommunications, beijing 100876, china 4 National key laboratory for Modern Communications, Chengdu 610041, china School of Computer Beijing University of Technology Beijing China state key laboratory of information security Graduate University of Chinese Academy of Sciences Beijing China School of Science Beijing University of Posts and Telecommunications Beijing China National key laboratory for Modern Communications Chengdu China

An efficient quantum secret sharing protocol with orthogonal product states in the 33 Hilbert space is presented. The particles in the orthogonal product states form two particle sequences. One sequence is sent to Bob and the other is sent to Charlie after rearranging the particle orders. With the help of Alice, Bob and Charlie make the corresponding local measurement to obtain the information of the or- thogonal product states prepared. This protocol has many distinct features such as great capacity and high efficiency.

关键词： quantum secret sharing orthogonal product state orthogonal measurement

Features and distribution patterns of chinese endemic seed plant species

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Journal of Systematics and Evolution 2011年第2期49卷 81-94页

作者： 1,2,3 Ji-Hong HUANG 1,4 Jian-Hua CHEN 5 Jun-Sheng YING 1 Ke-Ping MA 1 (state key laboratory of Vegetation and Environmental Change, Institute of Botany, chinese academy of sciences, beijing 100093, china) 2 (graduate university of chinese academy of sciences, beijing 100049, china) 3 (Center for Documentation and information, Institute of Botany, chinese academy of sciences, beijing 100093, china) 4 (Zhejiang Normal university, Jinhua 321004, china) 5 (Research Center of Systematic and Evolutionary Botany, Institute of Botany, chinese academy of sciences, beijing 100093, china) (state key laboratory of Vegetation and Environmental Change Institute of Botany Chinese Academy of Sciences Beijing 100093 China) (graduate university of chinese academy of sciences Beijing 100049 China) (Center for Documentation and information Institute of Botany Chinese Academy of Sciences Beijing 100093 China) (Zhejiang Normal university Jinhua 321004 China) (Research Center of Systematic and Evolutionary Botany Institute of Botany Chinese Academy of Sciences Beijing 100093 China)

We compiled and identified a list of chinese endemic seed plant species based on a large number of published references and expert reviews. The characters of these seed plant species and their distribution patterns were described at length. china is rich in endemic seed plants, with a total of 14 939 species (accounting for 52.1% of its total seed plant species) belonging to 1584 genera and 191 families. Temperate families and genera have a significantly higher proportion of endemism than cosmopolitan and tropical ones. The most primitive and derived groups have significantly higher endemism than the other groups. The endemism of tree, shrub, and liana or vine is higher than that of total species; in contrast, the endemism of herb is lower than that of total species. Geographically, these chinese endemic plants are mainly distributed in Yunnan and Sichuan provinces, southwest china. Species richness and proportion of these endemic plants decrease with increased latitude and have a unimodal response to altitude. The peak value of proportion of endemism is at higher altitudes than that of total species and endemic species richness. The proportions of endemic shrub, liana or vine, and herb increase with altitude and have a clear unimodal curve. In contrast, the proportion of tree increases with altitude, with a sudden increase at ～4000 m and has a completely different model. To date, our study provides the most comprehensive list of chinese endemic seed plant species and their basic composition and distribution features.

关键词： biodiversity conservation distribution pattern endemism flora of china seed plants.

Multiparty simultaneous quantum identity authentication with secret sharing

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Science china(Physics,Mechanics & Astronomy) 2008年第3期51卷 321-327页

作者： YANG YuGuang1,2,WEN QiaoYan3 & ZHANG Xing4,5 1 College of Computer Science and Technology,beijing university of Technology,beijing 100022,china 2.state key laboratory of information security (graduate university of the chinese academy of sciences),beijing 100049,china 3 School of Science,beijing university of Posts and Telecommunications,beijing 100876,china 4 Institute of Electronic Technology,information Engineering university,Zhengzhou 450004,china 5 Trusted Computing laboratory,beijing university of Technology,beijing 100022,china College of Computer Science and Technology Beijing University of Technology Beijing China state key laboratory of information security (graduate university of the chinese academy of sciences) Beijing China School of Science Beijing University of Posts and Telecommunications Beijing China Institute of Electronic Technology Information Engineering University Zhengzhou China Trusted Computing laboratory Beijing University of Technology Beijing China

Two multiparty simultaneous quantum identity authentication (MSQIA) protocols based on secret sharing are presented. All the users can be authenticated by a trusted third party (TTP) simultaneously. In the first protocol,the TTP shares a random key K with all the users using quantum secret sharing. The ith share acts as the authentication key of the ith user. When it is necessary to perform MSQIA,the TTP generates a random number R secretly and sends a sequence of single photons encoded with K and R to all the users. According to his share,each user performs the corresponding unitary operations on the single photon sequence sequentially. At last,the TTP can judge whether the impersonator exists. The sec-ond protocol is a modified version with a circular structure. The two protocols can be efficiently used for MSQIA in a network. They are feasible with current technol-ogy.

关键词： quantum identity authentication secret sharing quantum cryptography

Leakproof secret sharing protocols with applications to group identification scheme

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Science china(information sciences) 2012年第5期55卷 1172-1185页

作者： TANG ChunMing 1,2 & GAO ShuHong 3 1 School of Mathematics and information Science,Guangzhou university,Guangzhou 510006,china 2.state key laboratory of information security,Institute of Software Science,chinese academy of sciences,beijing 100049,china 3 Department of Mathematical sciences,Clemson university,SC 29634,USA School of Mathematics and information Science Guangzhou University Guangzhou China state key laboratory of information security Institute of Software Science Chinese Academy of Sciences Beijing China Department of Mathematical sciences Clemson University Clemson USA

In a traditional (t,n)-threshold secret sharing scheme,t or more honest participants can reconstruct the secret *** the reconstruction process,the individual shares and the secret key K are revealed,hence K is shared once *** this paper,we firstly give the definition of leakproof secret sharing scheme which is composed of a distribution protocol and a proof protocol,then propose two leakproof secret sharing protocols,a computationally secure protocol and an information-theoretically secure *** our protocols,t or more participants can jointly prove that they hold the secret K by using a multi-prover zero-knowledge argument of *** a result,the secret K will be shared for as many times as ***,each participant can detect the dealer in the distribution protocol from cheating,and any verifier can prevent non-qualified set of participants in proof protocol from *** an example of the practical impact of our work we use our techniques to construct group identification schemes with zero-knowledge.

关键词： secret sharing leakproof secret sharing multi-prover zero-knowledge argument proof of knowl-edge group identification scheme

Molecular identification of species in Juglandaceae:A tiered method

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Journal of Systematics and Evolution 2011年第3期49卷 252-260页

作者： 1,2Xiao-Guo XIANG 1,2Jing-Bo ZHANG 1An-Ming LU 1Rui-Qi LI* 1(state key laboratory of Systematic and Evolutionary Botany,Institute of Botany,chinese academy of sciences,beijing 100093,china) 2(graduate university of chinese academy of sciences,beijing 100049,china) (state key laboratory of Systematic and Evolutionary Botany Institute of Botany Chinese Academy of Sciences Beijing 100093 China) (graduate university of chinese academy of sciences Beijing 100049 China)

DNA barcoding is a method of species identification and recognition using DNA sequence data.A tiered or multilocus method has been recommended for barcoding plant *** this study,we sampled 196 individuals representing 9 genera and 54 species of Juglandaceae to investigate the utility of the four potential barcoding loci(rbcL,matK,trnH-psbA,and internal transcribed spacer(ITS)).Our results show that all four DNA regions are easy to amplify and *** the four tested DNA regions,ITS has the most variable information,and rbcL has the *** generic level,seven of nine genera can be efficiently identified by *** species level,ITS has higher interspecific p-distance than the trnH-psbA *** to align in the whole family,ITS showed heterogeneous variability among different *** for the monotypic genera(Cyclocarya,Annamocarya,Platycarya),ITS appeared to have limited power for species identification within the Carya and Engelhardia complex,and have no power for Juglans or ***,our results confirmed that a multilocus tiered method for plant barcoding was applicable and *** higher priority,matK is proposed as the first-tier DNA region for genus discrimination,and the second locus at species level should have enough stable variable characters.

关键词： DNA barcoding ITS Juglandaceae matK rbcL trnH-psbA.