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International Conference on Management of e-Commerce and e-Government, ICMECG

作者： Zuowen Tan Key Laboratory of Network Security and Cryptology School of Mathematics and Computer Science Fujian Normal University Fuzhou China School of Information Technology Jiangxi University of Finance and Economics Nanchang Jiangxi China State Key Laboratory of Information Security Institute of Software of Chinese Academy of Sciences Beijing China

Recently, Das et al. and Tseng et al. proposed a remote user authentication scheme using bilinear pairings, respectively. They can provide a flexible password change option to the users without any help from the remote server. However, some weaknesses of the two bilinear pairing based remote password authentication schemes are found in the paper. The schemes suffer from offline password guessing attack and impersonation attacks.

关键词： Authentication Identity-based encryption network servers Information security Elliptic curve cryptography Public key Elliptic curves Computer security Galois fields Computer network management

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Simulation and comparison of transient stability of power system including DFIGs wind farm based on detailed model

Simulation and comparison of transient stability of power sy...

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International Conference on Sustainable Power Generation and Supply, SUPERGEN

作者： Li Lin Hongjing Hou Wenxia Li Sheng Jing Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China Production & Technology Department Zhumadian Electric Power Company Henan China

This article is concerned with the impact of large-scale wind farms utilizing double fed induction generator (DFIG) on the transient stability to a general power system. In the first instance, the synthetical dynamic model of the wind turbine generators (WTGs) is introduced, including pitch angle control model and the generator protective model. And then, the simulation is made to the CIGRE B4-39 standard grid through the comparison between synchronous generator integration and wind farm based DFIG integration with the same power capacity. The simulation is also contained after the load and the topological structure changed. The conclusion shows that the transient stability of the power system including DFIGs wind farm is more robust than conventional synchronous generator connected.

关键词： Power system simulation Power system transients Power system stability Power system modeling Wind farms Power system dynamics Induction generators Power system protection Wind energy generation Synchronous generators

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Modal analysis concerning the control mode of doubly-fed induction generator

Modal analysis concerning the control mode of doubly-fed ind...

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International Conference on Sustainable Power Generation and Supply, SUPERGEN

作者： Li Lin Liangliang Song Wenxia Li Sheng Jing Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China Henan Electric Power Technical Institute Management of Production & Technology Department Zhumadian Electric Power Company China

The paper deals with the impact of wind power integration on power system small signal stability. The DFIG wind turbine consisting of a back-to-back PWM converter is introduced. Generator model is given first, ignoring the transient of stator. The converter control, shaft and pitch angle control diagrams are picked out for a detailed study subsequently. A case study is performed in part three, eigen-analysis of a modified IEEE 14 system is conducted considering the PF and VT control modes of wind farm. The pole map gives an intuitionistic view that DFIG introduces two oscillation modes related to the shaft and VAR controller model respectively. Eigen-structure depicts the electromechanical oscillation modes, and comparison of DFIG and SG case was studied which gives an overall conclusion that DFIG can have a favorable performance. Also the influence of increased penetration of wind power is examined.

关键词： Modal analysis Induction generators Power system modeling Wind energy Power system stability Power system transients Shafts Power system analysis computing Wind turbines Pulse width modulation converters

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Fuzzy analytic hierarchy process-based utilities evaluation and adoption for DRM security policies

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Tongxin Xuebao/Journal on Communications 2009年第1 A期30卷 126-131页

作者： Zhang, Zhi-Yong Ye, Chuan-Qi Fan, Ke-Feng Zhang, Li-Li Niu, Dan-Mei Electronics Information Engineering College Henan University of Science and Technology Luoyang 471003 China Ministry of Education Key Laboratory of Computer Network and Information Security Xidian University Xi'an 710071 China Information Security Center for the State Key Laboratory of Network and Exchange Beijing Post and Telecom University Beijing 100158 China

The utility evaluation of DRM security policies based on fuzzy analytic hierarchy process (FAHP) and their game-theoretic adoptions were proposed from a novel perspective of the different level security and utilities' analyses. Based on the analytic hierarchy structure, the fuzzy estimation consistency matrix was employed to analyze the weights of optional security components and services, and then the gained weight values were further used for the computing of security policies' utilities and the accomplishing the game, finally yielding Nash equilibriums, that is, optimal policies profiles, as well as pre-conditions for participants. The use case for a group of the typical security policies shows that the result of the game includes two different groups of security policies profiles, as well as contents/services provider could effectively deploy a DRM system in term of the number of consumers purchasing digital contents, and average purchase, thus achieving the balance between the digital copyrights protection and real payoffs of participants.

关键词： Game theory

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Detection of drive-by downloads based on dynamic page views

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Qinghua Daxue Xuebao/Journal of Tsinghua University 2009年第SUPPL. 2期49卷 2126-2132页

作者： Zhang, Huilin Zhuge, Jianwei Song, Chengyu Han, Xinhui Zou, Wei Institute of Computer Science and Technology Peking University Beijing 100871 China Key Laboratory of Network and Software Security Assurance of Ministry of Education Peking University Beijing 100871 China

A dynamic page view based drive-by download detection method was developed to address the challenge hidden drive-by downloads which abuse inline linking dynamics creation and obfuscation. The method uses a script engine to execute page scripts with tools to reveal the script's actions and inline linking identification mechanisms and rebuilds the dynamic page view of the visited page by recursively analyzing the inline pages. The system then detects drive-by downloads based on the rebuilt dynamic page view. Tests on a prototype based on the open-sourced PHoneyC framework to detect 89 drive-by download samples showed that single page views in this paper had a detection rate of 29.2%, static page views had a detection rate of 43.8%, and the dynamic page views had a detection rate of 70.8%. Thus, the dynamic detection method has a much higher detection rate.

关键词： network security

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Novel evidence combination method based on proportional conjunctive and complementary pooling criterion

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Tien Tzu Hsueh Pao/Acta Electronica Sinica 2009年第1期37卷 95-100页

作者： Lang, Feng-Hua Gu, Li-Ze Yang, Yi-Xian Niu, Xin-Xin Information Security Center State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China Key Laboratory of Network and Information Attack and Defence Technology Beijing University of Posts and Telecommunications Beijing 100876 China National Engineering Laboratory for Disaster Backup and Recovery Beijing University of Posts and Telecommunications Beijing 100876 China

To solve the drawbacks of Dempster rule and improved rule of combination, a novel evidence combination method based on proportional conjunctive and complementary pooling criterion was presented. Firstly, the advantages and disadvantages of Dempster rule of combination were analyzed. Secondly, a new mass function based on proportional belief criterion of conjunctive and complementary belief was combined. Finally, the results of numerical examples show that the proposed approach of combination can not only maintain the advantages of original Dempster rule of combination, but also make up for its disadvantages.

关键词： Conjunctive and complementary pooling Dempster rule of combination Evidence theory Proportional belief assignment

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Overview security analysis of 3G authentication protocols and technical specifications

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Qinghua Daxue Xuebao/Journal of Tsinghua University 2009年第SUPPL. 2期49卷 2193-2199页

作者： Cao, Chenlei Zhang, Ru Niu, Xinxin Zhou, Linna Zhang, Zhentao Information Security Centre of State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China Key Laboratory of Network and Information Attack and Defense Technology of Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China Department of Electronic Engineering Tsinghua University Beijing 100084 China National Cyber-Net Security Ltd Beijing 100088 China

This paper presents an analysis of 3GPP (3rd generation partnership project) security protocols and related technical specifications to further development of the 3G (3rd-generation) security protocol standards. A mathematical model of the authentication traffic throughput was developed based on the theory of independent and identically distributed probabilities. The research identifies some security vulnerabilities in these protocols, such as the unidirectional process of entity authentication and the unbalanced distribution of authentication traffic, as well as the system complexity. Future development of the 3G security authentication mechanism can be based on IBC (identity-based cryptography) theory.

关键词： Authentication

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security and trust in digital rights management: A survey

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International Journal of network security 2009年第3期9卷 247-263页

作者： Zhang, Zhiyong Pei, Qingqi Ma, Jianfeng Yang, Lin Ministry Of Education Key Laboratory of Computer Network and Information Security Xidian University Taibai South Road No.2 Xi'an Shannxi 710071 China Electronic Information Engineering College Henan University of Science and Technology Xiyuan Road No.48 Luoyang Henan 471003 China The Research Institute China Electronic Equipment and Systems Engineering Corporation Dacheng Road 13 Beijing 100141 China

A successful transaction of digital contents is primarily dependent on security policies, trust relationships and benefit equilibriums among various participants in a DRM (Digital Rights Management)-enabling contents value chain ecosystem. We first analyzed basic value chain architectures in existence, together with some fundamental security and trust requirements. And then, a state-of- the-art anatomy of the security and trust related to DRM was presented from different stakeholder' perspectives. Next, some challenges for multi-party mutual trust, not just inclined to any of participants, were proposed based on the holistic consideration of the digital contents/rights protection and the benefits balance. Finally, a conclusion was drawn that the rights-benefits-centric DRM ecosystem and the resulting trust relationship are crucial for the survivability of the contents industry.

关键词： Ecosystems

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New method for interactive TCP traffic replay based on balance-checking between transmitted and received packets

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Jisuanji Xuebao/Chinese Journal of Computers 2009年第4期32卷 835-846页

作者： Chu, Wei-Bo Cai, Zhong-Min Guan, Xiao-Hong Chen, Ming-Xu MOE Key Laboratory for Intelligent Networks and Network Security Xi'an Jiaotong University Xi'an 710049 China State Key Laboratory for Manufacturing Systems Xi'an Jiaotong University Xi'an 710049 China Tsinghua National Laboratory for Information Science and Technology Department of Automation Tsinghua University Beijing 100084 China

Interactive network traffic replay is the newest method for testing and evaluation of network devices such as Firewalls, IPSes, routers, switches, etc. Currently state-checking method is used for interactive TCP traffic replay. This paper proposes a new method for interactive TCP traffic replay which is based on the balance status between transmitted and received packets. By checking the balance conditions before sending out TCP packets, the method can significantly reduce the cost of state-checking and enhance the replay performance. The authors made a comparison on the differences of replay methods when introducing the balance mechanism. The efficiency of the method is also investigated and evaluated from aspects of a single TCP session, multi-session traffic, packet losses and latency. Experimental results show that the method outperforms the original state-checking method when replaying actual TCP traffics.

关键词： network security

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Threshold quantum secret sharing between multi-party and multi-party

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Science China(Physics,Mechanics & Astronomy) 2008年第9期51卷 1308-1315页

作者： YANG YuGuang1,2,3 & WEN QiaoYan4 1 College of Computer Science and technology,beijing University of technology,beijing 100124,China 2 State key laboratory of Integrated Services network,Xidian University,Xi’an 710071,China 3 State key laboratory of Information security (Graduate University of Chinese Academy of Sciences),beijing 100049,China 4 State key laboratory of networking and Switching technology,beijing University of Posts and Tele-communications,beijing 100876,China College of Computer Science and Technology Beijing University of Technology Beijing 100124 China State Key Laboratory of Integrated Services Network Xidian University Xi’an 710071 China State Key Laboratory of Information Security (Graduate University of Chinese Academy of Sciences) Beijing 100049 China State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China

A threshold quantum secret sharing (TQSS) scheme between multi-party and multi-party was proposed using a sequence of single photons,which is useful and efficient when the parties of communication are not all present. We described the process of this TQSS scheme and discussed its security. It was shown that entan-glement is not necessary for quantum secret sharing. Moreover,the theoretic effi-ciency was improved to approach 100% as almost all the instances can be used for generating the private key,and each photon can carry one bit of information. This protocol is feasible with the present-day technique.

关键词： threshold quantum secret sharing quantum cryptography single photon multi-party and multi-party

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