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A formal model of fair exchange protocols

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Science in china(Series F) 2005年第4期48卷 499-512页

作者： QING Sihan1,2.3.& LI Gaicheng1,2.3.1. {2. research center for {3. security technology, Institute of Software, chinese Aca- demy of sciences, Beijing 100080, china 2. Beijing Zhongke Ansheng Corporation of {3. technology, Beijing 100080, china 3. Graduate School of the chinese Academy of sciences, Beijing 10003., china engineering research {2. for {3. security technology Institute of Software Chinese Aca- demy of Sciences Beijing Zhongke Ansheng Corporation of information technology Graduate School of the chinese Academy of sciences

Based on the study of existing fair exchange protocols, this paper sets up an accurate formal model by stepwise refinement. In the process of refinement an unreliable channel is employed to simulate an attack behavior. The model provides a novel formal definition of exchanged items, and presents the formal goals for fairness, accountability, etc., reflecting the inherent requirements for fair exchange protocols across-the-board. In order to check, prove, and design fair exchange protocols effectively and efficiently, the model puts forward a novel property of abuse-freeness which applies to all fair exchange protocols, gives a formal definition for trust strand of the third party, and presents general criteria of designing a secure and effective fair exchange protocol. Taking a typical fair exchange protocol as an example, this paper presents the analysis steps of fair exchange protocols appealing to our model. An unknown attack is uncovered. The analysis reveals the process of a complete attack, discovering deeper reasons for causing an attack. Finally, we modify the flawed protocol and the revised protocol ensures the desirable properties.

关键词： events local causal relation local temporal relation global relation exchanged item security goals.

Formal analysis and design of multi-party fair exchange protocols

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Science in china(Series F) 2006年第2期49卷 155-174页

作者： QING Sihan1,2.3.& LI Gaicheng1,3.1. {2. research center for {3. security technology, Institute of Software, chinese Academy of sciences, Beijing 100080, china 2. Beijing Zhongke Ansheng Corporation of {3. technology, Beijing 100080, china 3. Graduate School of the chinese Academy of sciences, Beijing 10003., china engineering research {2. for {3. security technology Institute of Software Chinese Academy of Sciences Beijing Zhongke Ansheng Corporation of information technology Graduate School of the chinese Academy of sciences

Based on the origin of message items and channel combination between transacting parties, and events and relations among events, this paper presents a concise, precise, and hierarchical model for general fair exchange protocols, formally specifies various security requirements which are able to reflect inherent requirements for fair exchange protocols more rigorously, and partition these security requirements with fine granularity. This work helps analyze, debug, and design multi-party fair exchange protocols more effectively and elaborately,

关键词： fair exchange logical protocol formal model security requirement.

Identifying heavy hitters in high-speed network monitoring

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Science china(information {2.) 2010年第3期53卷 659-676页

作者： ZHANG Yu1, FANG BinXing1,2.& ZHANG YongZheng2.1research center of Computer Network and {2. {3. technology, Harbin Institute of technology, Harbin 150001, china 2.0} center of {2. {3., Institute of Computing technology, {12. Academy of {13., Beijing 100190, china research center of Computer Network and {2. {3. technology Harbin Institute of Technology research center of {2. {3. Institute of Computing Technology Chinese Academy of Sciences

Identifying heavy hitters in a network traffic stream is important for a variety of network applications ranging from traffic engineering to anomaly detection such as detection of denial-of-service attacks. Existing methods generally examine newly arriving items in the stream, perform a small number of operations using a small amount of memory, and still provide guarantees on the identifying accuracy. In high-speed network monitoring, the update speed per item is extremely critical. However, so far as we know, there are no identifying algorithms which can provide constant update time (O(1)) in a weighted data stream. In this paper, we present an algorithm named Weighted Lossy Counting (WLC) which is able to identify heavy hitters in a high-speed weighted data stream with constant update time. WLC employs a novel efficient partially ordered data structure which is able to provide a fast per-item update speed while keeping the memory cost relatively low. We compare WLC with state-of-the-art algorithms for finding heavy hitters in real traffic traces. The experimental results show that WLC performs well in accuracy (recall, precision and average relative error) as other algorithms; moreover it has a much higher update speed at the cost of relatively larger memory space used. A theoretical worst-case memory bound of WLC is also derived in this paper; however, experiments with long real traffic traces show that WLC requires much less space than the theoretical bound in practice.

关键词： network traffic monitoring heavy hitter weighted data streams

Polynomial analysis of canopy spectra and biochemical component content inversion

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Science china Earth sciences 2005年第10期48卷 1780-1791页

作者： YAN Chunyan1, LIU Qiang1, NIU Zheng1, WANG Jihua2. HUANG Wenjiang2.& LIU Liangyun 2.1. State Key Laboratory of Remote Sensing Science, Jointly Sponsored by the Institute of Remote Sensing Applications of chinese Academy of sciences and Beijing Normal University, Beijing 100101,{2. 2. National {3. research center for information technology in Agriculture, Beijing 100089,{2. Jointly Sponsored by the Institute of Remote Sensing Applications of chinese Academy of sciences and Beijing Normal University National engineering research {2. for {3. technology in Agriculture

A polynomial expression model was developed in this paper to describe directional canopy spectra, and the decomposition of the polynomial expression was used as a tool for re-trieving biochemical component content from canopy multi-angle spectra. First, the basic formula of the polynomial expression was introduced and the physical meaning of its terms and coeffi-cients was discussed. Based on this analysis, a complete polynomial expression model and its decomposition method were given. By decomposing the canopy spectra simulated with SAILH model, it shows that the polynomial expression can not only fit well the canopy spectra, but also show the contribution of every order scattering to the whole reflectance. Taking the first scattering coefficients a10 and a01 for example, the test results show that the polynomial coefficients reflect very well the hot spot phenomenon and the effects of viewing angles, LAI and leaf inclination angle on canopy spectra. By coupling the polynomial expression with leaf model PROSPECT, a canopy biochemical component content inversion model was given. In the simulated test, the canopy multi-angle spectra were simulated by two different models, SAILH and 4-SCALE re-spectively, then the biochemical component content was retrieved by inverting the coupled polynomial expression + PROSPECT model. Results of the simulated test are promising, and when applying the algorithm to measured corn canopy multi-angle spectra, we also get relatively accurate chlorophyll content. It shows that the polynomial analysis provides a new method to get biochemical component content independent of any specific canopy model.

关键词： polynomial expression, canopy spectra, decomposition, biochemical component content, inversion.

Black-box testing based on colorful taint analysis

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Science china(information {2.) 2012年第1期55卷 171-183页

作者： CHEN Kai1,2.3.FENG DengGuo1,SU PuRui1&ZHANG YingJun1,2.3.1State Key Laboratory of {2. security,Institute of Software,chinese Academy of Science,Beijing 100190,{3. 2.tate Key Laboratory of {2. security,Graduate University of chinese Academy of sciences,Beijing 100049,{3. 3.ational {12. research center of {2. security,Beijing 100190,{3. State Key Laboratory of information security Institute of Software Chinese Academy of Science State Key Laboratory of information security Graduate University of Chinese Academy of Sciences National engineering research {2. of {3. security

Software vulnerability detection is one of the most important methods for guaranteeing software *** main classes of methods can detect vulnerabilities in binary files:white-box testing and black-box *** former needs to construct and solve path constraints to detect *** has two main drawbacks:path exploding and complexity of *** latter often aimlessly exhausts various inputs to test binary *** paper combines both testing methods to detect vulnerabilities in binary *** analyzing the input elements that aect check condition corresponding to a certain check point,we can generate one class of inputs that get to the check point to increase fuzzing *** analyzing the relationship between guard conditions and check condition,the redundant check points are *** taint analysis method(CTAM)is proposed to compute guard conditions,which is more ecient than traditional taint analysis method(TTAM).We implemented a prototype and made several experiments on *** results showed that our method could increase the eciency of black-box testing.

关键词： software testing vulnerability detection dynamic testing black-box testing colorful taint analysis

Channel-aware and queue-aware joint-layer resource optimization for cognitive radio networks

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Science china(information {2.) 2010年第12期53卷 2576-2583页

作者： GUO KunQi 1,2.SUN LiXin 1,LI Yong 2.& JIA ShiLou 3.1 School of Computer Science and Telecommunication engineering,Jiangsu University,Zhenjiang 2.2.13.china 2.research {3. for Wireless Communication,Shanghai Institute of Microsystem and information technology,chinese Academy of sciences,Shanghai 2.0050,china 3.Communication research {3.,Harbin Institute of technology,Harbin 150001,china School of Computer Science and Telecommunication engineering Jiangsu University research center for Wireless Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Communication research center Harbin

An optimization model is derived to maximize the utilization efficiency of the idle channels of primary users(PU) in cognitive radio *** the optimization model,Lyapunov optimization method is used to allocate the idle channels of PU to secondary user(SU) most *** time distribution of the idle channels of PU is predicted by a low-pass time *** algorithm is proposed to implement the optimization *** algorithm is efficient because of using a greedy selection *** efficiency of the algorithm is demonstrated by mathematic analyses and simulation results.

关键词： cognitive radio networks Lyapunov optimization resource utilization primary user secondary user

A property-based attestation protocol for TCM

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Science china(information {2.) 2010年第3期53卷 454-464页

作者： FENG DengGuo1,2.& QIN Yu1,2.1State Key Laboratory of information security, Institute of Software, {2. Academy of Science, Beijing 100190,{3. 2.ational engineering research center of information security, Beijing 100190,{3. State Key Laboratory of information security Institute of Software Chinese Academy of Science National engineering research {2. of {3. security

This paper presents a property attestation protocol for the security chip TCM (trusted cryptographic module) via analyzing the problems of the current property attestation, which is built on the property attestation model with the online trust third party. In the protocol the prover utilizes the zero-knowledge proof by the attribute certificates, configuration commitment and TCM signature, and attests its configuration and status which are compliant with the declarative security property. The protocol is characterized by shorter signature length and lower computations. The security of the protocol is proved at the random oracle model. The protocol can help extend application and improve standard for security chip TCM, and it also has practical value and immediate significance.

关键词： trust computing trust cryptographic module (TCM) property attestation signature of knowl- edge configuration commitment

Accountable authority key policy attribute-based encryption

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Science china(information {2.) 2012年第7期55卷 1631-1638页

作者： WANG YongTao 1,2.,CHEN KeFei 1,3.,LONG Yu 1,4 & LIU ZhaoHui 2.1 Department of Computer Science and engineering,Shanghai Jiao Tong University,Shanghai 2.02.0,{2. 2.3} {3. technology security Evaluation center,Beijing 100085,{2. 3.Shanghai Key Laboratory of Scalable Computing and Systems,Shanghai Jiao Tong University,Shanghai,2.02.0,{2. 4 State Key Laboratory of {3. security,Graduate School of chinese Academy of sciences,10003.,{2. Department of Computer Science and engineering Shanghai Jiao Tong University Shanghai China china information {2. {3. Evaluation center Beijing China Shanghai Key Laboratory of Scalable Computing and Systems Shanghai Jiao Tong University Shanghai China State Key Laboratory of information security Graduate School of Chinese Academy of Sciences Beijing China

We present an accountable authority key policy attribute-based encryption (A-KPABE) *** this paper,we extend Goyal's work to key policy attribute-based encryption *** first generalize the notion of accountable authority in key policy attribute-based encryption scenario,and then give a *** addition,our scheme is shown to be secure in the standard model under the modified Bilinear Decisional Diffie-Hellman (mBDDH) assumption.

关键词： accountable authority key policy attribute-based encryption standard model access structure

Risk analysis model for landslide mass of high slope in dam area

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Science china(Technological sciences) 2008年第S2期51卷 25-31页

作者： GU ChongShi1,2.HE XianFeng3.4,WU ZhongRu1,2.& SU HuaiZhi1,2.1 College of Water Conservancy and Hydropower engineering,Hohai University,Nanjing 2.0098,{2. 2.National engineering {3. center of Water Resources Efficient Utilization and engineering Safety,Nanjing 2.0098,{2. 3.Yellow River Institute of Hydraulic {3.,Zhengzhou 450003.{2. 4 Embankment {12. Defect Prevention and Control engineering {3. center of MWR,Zhengzhou 450003.{2. College of Water Conservancy and Hydropower engineering Hohai University Nanjing China National engineering research {2. of Water Resources Efficient Utilization and engineering Safety Nanjing China Yellow River Institute of Hydraulic research Zhengzhou China Embankment security Defect Prevention and Control engineering {2. {3. of MWR Zhengzhou China

In order to identify the threat of reservoir bank landslide to dam safety and reduce the risk of dam failure,impact factors of the landslide are *** concept of landslide risk degree is put forward to measure the threat of landslide to dam *** monotony of the landslide risk assessment function which changes with different affecting factors is analyzed *** on gene automatic programming,a data mining model of the landslide risk assessment function is constructed combined with impact factors of reservoir bank landslide on dam *** the assessment function of landslide risk has been excavated and established according to practical project information,which provides a valuable reference for analyzing the impact of landslide on dam risk.

关键词： landslide dam failure risk landslide risk