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2012 International Conference on Computer Science and Service System, CSSS 2012

作者： Zhang, Zhao Wen, Qiao-Yan Tang, Wen State Key Laboratory of Network and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China IT Security Cooperate Technology Siemens Ltd. China Beijing 100102 China

ISBN: (纸本)9780769547190

security flaws existed in protocol implementations might be exploited by malicious attackers and the consequences can be very serious. Therefore, detecting vulnerabilities of network protocol implementations is becoming a hot research topic recently. However, protocol security test is a very complex, challenging and error-prone task, as constructing test packets manually or randomly are not practical. This paper presents an efficient mutation-based approach for detecting implementation flaws of network *** with other protocol testing tools, our approach divides the procedure of protocol testing into many phases, and flexible design can cover many testing cases for the protocol implementations under testing, and could apply for testing various protocol implementations quite easily. Besides, this approach is more comprehensible that makes the protocol security test easier to carry out. To assess the usefulness of this approach, several experiments are performed on four FTP server implementations and the results showed that our approach can find flaws of protocol implementation very easily. The method is of the important application value and can improve the security of network protocols. © 2012 IEEE.

关键词： Testing

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An evaluation model of botnet based on peer to peer 4th

An evaluation model of botnet based on peer to peer

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4th International Conference on Computational Intelligence and Communication networks, CICN 2012

作者： Jian, Gao Zheng, Kangfeng Yang, Yixian Niu, Xinxin Chinese People's Public Security University BeiJing China Key Laboratory of Network and Information Attack and Defence Technology of MOE Beijing University of Posts and Telecommunications BeiJing China

ISBN: (纸本)9781467329811

We propose a evaluation model of botnet based on peer to peer. We propose key metrics to measure their activities(e.g, Stealthy, Effectiveness, Efficiency and Robustness). Using these performance metrics, we can study p2p botnet in a systematic way, and more convenient to find the method to defense botnet. In particular, our models show that the important relationship between degree and these metrics in p2p botnet. Our experiments prove that, the degree of nodes play an important role in evaluating robust of botnet, at the same time, the differences of node degree also an important metric in our evaluation system. We evaluate some botnet using simulation and demonstrate the utility of our proposed metrics. Our analysis show how botnet can be evaluated according to structure and communication using our proposed metrics. © 2012 IEEE.

关键词： Botnet peer to peer Peers Metronidazole Performance metrics

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Efficient DPCA SAR imaging with fast iterative spectrum reconstruction method

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Science China(Information Sciences) 2012年第8期55卷 1838-1851页

作者： FANG Jian1,ZENG JinShan1,XU ZongBen1&ZHAO Yao2 1M inistry of Education key Lab for Intelligent networks and network security Xi'an Jiaotong University,Xi'an 710049,China 2N ational key laboratory of Science and technology on Microwave Imaging&Institute of Electronics,Chinese Academy of Sciences,beijing 100049,China 1. Ministry of Education Key Lab for Intelligent Networks and Network Security Xi’an Jiaotong University Xi’an 710049 China2. National Key Laboratory of Science and Technology on Microwave Imaging & Institute of Electronics Chinese Academy of Sciences Beijing 100049 China

The displaced phase center antenna(DPCA)technique is an effective strategy to achieve wide-swath synthetic aperture radar(SAR)imaging with high azimuth ***,traditionally,it requires strict limitation of the pulse repetition frequency(PRF)to avoid non-uniform ***,any deviation could bring serious ambiguity if the data are directly processed using a matched *** break this limitation,a recently proposed spectrum reconstruction method is capable of recovering the true spectrum from the nonuniform ***,the performance is sensitive to the selection of the *** regularization based imaging may provide a way to overcome this *** existing time-domain method,however,requires a large-scale observation matrix to be built,which brings a high computational *** this paper,we propose a frequency domain method,called the iterative spectrum reconstruction method,through integration of the sparse regularization technique with spectrum analysis of the DPCA *** approximately expressing the observation in the frequency domain,which is realized via a series of decoupled linear operations,the method performs SAR imaging which is then not directly based on the observation matrix,which reduces the computational cost from O(N2)to O(N log N)(where N is the number of range cells),and is therefore more efficient than the time domain *** sparse regularization scheme,realized via a fast thresholding iteration,has been adopted in this method,which brings the robustness of the imaging process to the PRF *** provide a series of simulations and ground based experiments to demonstrate the high efficiency and robustness of the *** simulations show that the new method is almost as fast as the traditional mono-channel algorithm,and works well almost independently of the PRF ***,the suggested method can be accepted as a practical and efficient wide-swath SAR imaging technique.

关键词： displaced phase center antenna sparse regularization iterative thresholding spectrum reconstruction

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High capacity steganographic method based upon quantization error of JPEG

High capacity steganographic method based upon quantization ...

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2012 2nd International Conference on Computer Application and System Modeling, ICCASM 2012

作者： Dong, Xiuze Liu, Shu Zhang, Ru Niu, Xinxin Wang, Lifeng Information Security Center Beijing University of Posts and Telecommunications Beijing 100876 China Electronic and Information Engineering Department Beijing Electronic Science and Technology Institute Beijing 100070 China Key Laboratory of Information Network Security Ministry of Public Security Shanghai 201204 China Computer Science and Technology Department Beijing Electronic Science and Technology Institute Beijing 100070 China

ISBN: (纸本)9789491216008

Quantizing Error during the process of JPEG compression is analyzed, and a new information hiding algorithm is proposed based on Quantizing Error of JPEG image. Experimental results show that the proposed algorithm can provide a high capacity information hiding and keep the visual quality well, also the produced stego-image are almost identical to the original cover images. © The Authors.

关键词： Image compression

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Corrigendum to “A variable-length model for masquerade detection” [J. Syst. Softw. 85 (2012) 2470–2478]

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Journal of Systems and Software 2013年第3期86卷 868-868页

作者： Xi Xiao Xinguang Tian Qibin Zhai Shutao Xia Graduate School at Shenzhen Tsinghua University 518055 Shenzhen China State Key Laboratory of Information Security Graduate University of Chinese Academy of Sciences 100049 Beijing China Key Laboratory of Network Science and Technology Institute of Computing Technology Chinese Academy of Sciences 100190 Beijing China

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An new anonymous authentication scheme for cloud computing

An new anonymous authentication scheme for cloud computing

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2012 7th International Conference on Computer Science and Education, ICCSE 2012

作者： Zhang, Zhi-Hua Li, Jian-Jun Jiang, Wei Zhao, Yong Gong, Bei China Tobacco Zhejiang Iidustrial Co. Ltd. Hangzhou 310009 China College of Computer Science Beijing University of Technology Beijing 100124 China Key Laboratory of Information and Network Security 3rd Research Institute Ministry of Public Security Beijing 100124 China Beijing 100124 China

ISBN: (纸本)9781467302425

Cloud computing is a hot topic of current research, for anonymous authentication is required in many applications scenarios of e-business based on cloud computing, users do not want to expose their identity, users just hope that service providers know they are legitimate users like, for this application, this paper presents a anonymous authentication scheme without certificate, which this scheme avoids the issues how to revocation public key certificate and the escrow problem of key, and then the security of the scheme is analyzed. © 2012 IEEE.

关键词： Cloud computing

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On the resistance of Boolean functions against fast algebraic attacks

On the resistance of Boolean functions against fast algebrai...

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14th International Conference on Information security and Cryptology, ICISC 2011

作者： Du, Yusong Zhang, Fangguo Liu, Meicheng School of Information Science and Technology Sun Yat-sen University Guangzhou 510006 China Key Lab. of Network Security and Cryptology Fujian Normal University Fuzhou 350007 China State Key Laboratory of Information Security Institute of Software Chinese Academy of Sciences Beijing 100190 China

ISBN: (纸本)9783642319112

Boolean functions with large algebraic immunity resist algebraic attacks to a certain degree, but they may not resist fast algebraic attacks (FAA's). It is necessary to study the resistance of Boolean functions against FAA's. In this paper, we localize the optimal resistance of Boolean functions against FAA's and introduce the concept of e-fast algebraic immunity (e-FAI) for n-variable Boolean functions against FAA's, where e is a positive integer and . We give the sufficient and necessary condition of e-FAI. With e-FAI the problem of deciding the resistance of an n-variable Boolean function against FAA's can be converted into the problem of observing the properties of one given matrix. An algorithm for deciding e-FAI and the optimal resistance against FAA's is also described. © 2012 Springer-Verlag.

关键词： Boolean functions

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Novel steganography using JPEG-compressed images

International Journal of Digital Content Technology and its ...

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International Journal of Digital Content technology and its Applications 2012年第23期6卷 319-325页

作者： Dong, Xiuze Liu, Shu Zhang, Ru Niu, Xinxin Information Security Center Beijing University of Posts and Telecommunications China Beijing Electronic Science and Technology Institute China Key Laboratory of China Information Network Security Ministry of Public Security China

In this paper, a novel steganography based on joint photographic expert-group (JPEG) is proposed. The proposed method embeds two secret bits into each middle frequency coefficient using the least two-significant bits (2-LSBs). For the rest coefficients, the quantization error, resulting from processing the JPEG-compressed image, is compensated while embedding variable-length secret bits. At last, a JPEG stego-image is generated using the quality factor with the value of 100. Experimental results show that, the proposed steganographic method can provide a high information hiding capacity and keep the visual quality well.

关键词： Steganography

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Mining Protocol State Machines by Interactive Grammar Inference

Mining Protocol State Machines by Interactive Grammar Infere...

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第三届数字制造与自动化国际会议

作者： Zhao Zhang Qiao-Yan Wen Wen Tang State Key Laboratory of Network and Switching Technology Beijing University of Posts and Telecommunications IT Security Cooperate Technology Siemens Ltd

Protocol state machine is very essential in network security and implementation fields, however, improper management of software evolution, compounded by changing and imprecise requirements, along with "short time to market" phenomenon, often leads to a lack of up-to-date specifications and they are often characterized by bugs, anomalies and even threads. How to mine the accurate protocol state machine under investigation is still an open problem. We address this problem by using an interactive grammar inference technique as it could generate queries to the protocol implementation in learning process. This paper describes: (1) a flexible method to construct and parse real packet according to the packet format, (2) how to generate packet queries to explore protocol state machine space, (3) applies the QSM technology to mine protocol state machine from network traces. To access the usefulness of our approach, several experiments for different protocols are performed and we could get more objective and accurate results compared with other protocol specification mining methods.

关键词： Protocol State Machine Specification Mining Active Learning Grammatical Inference Protocol Modeling

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An Efficient Mutation-Based Fuzz Testing Approach for Detecting Flaws of network Protocol

An Efficient Mutation-Based Fuzz Testing Approach for Detect...

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International Conference on Computer Science and Service System (CSSS)

作者： Zhao Zhang Qiao-Yan Wen Wen Tang State Key Laboratory of Network and Switching Technology Beijing University of Posts and Telecommunications Beijing China IT Security Cooperate Technology Siemens Limited China Beijing China

ISBN: (纸本)9781467307215

security flaws existed in protocol implementations might be exploited by malicious attackers and the consequences can be very serious. Therefore, detecting vulnerabilities of network protocol implementations is becoming a hot research topic recently. However, protocol security test is a very complex, challenging and error-prone task, as constructing test packets manually or randomly are not practical. This paper presents an efficient mutation-based approach for detecting implementation flaws of network protocol. Compared with other protocol testing tools, our approach divides the procedure of protocol testing into many phases, and flexible design can cover many testing cases for the protocol implementations under testing, and could apply for testing various protocol implementations quite easily. Besides, this approach is more comprehensible that makes the protocol security test easier to carry out. To assess the usefulness of this approach, several experiments are performed on four FTP server implementations and the results showed that our approach can find flaws of protocol implementation very easily. The method is of the important application value and can improve the security of network protocols.

关键词： Protocols Testing Servers Buffer overflows Authentication

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