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Quantum secret sharing between multiparty and multiparty with entanglement swapping

The Journal of China Universities of Posts and Telecommunications 2008年第4期15卷 63-68页

作者： LIN Song GAO Fei QIN Su-juan WEN Qiao-yan ZHU Fu-chen State key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China Laboratory of Network Security and Cryptology Fujian Normal University Fuzhou 350007 China National Laboratory for Modern Communications Chengdu 610041 China

A quantum secret sharing （QSS） protocol between multiparty and multiparty is proposed, based on Greenberger-Horne- Zeilinger （GHZ） state. The protocol utilizes quantum Fourier transform and entanglement swapping to achieve a high intrinsic efficiency and source capacity. Then, the security of this protocol against some possible eavesdropping strategies has been analyzed. Furthermore, the presented protocol is generalized to the d-level case.

关键词： entanglement swapping quantum Fourier transform quantum secret sharing

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Threshold proxy quantum signature scheme with threshold shared verification

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Science China(Physics,Mechanics & Astronomy) 2008年第8期51卷 1079-1088页

作者： YANG YuGuang1,3,4 & WEN QiaoYan2 1 College of Computer Science and technology,beijing University of technology,beijing 100124,China 2 State key laboratory of networking and Switching technology,beijing University of Posts and Tele-communications,beijing 100876,China 3 State key laboratory of Integrated Services network,Xidian University,Xi’an 710071,China 4 State key laboratory of Information security(Graduate University of Chinese Academy of Sciences) ,beijing 100049,China 1. College of Computer Science and Technology Beijing University of Technology Beijing 100124 China 3. State Key Laboratory of Integrated Services Network Xidian University Xi’an 710071 China 4. State Key Laboratory of Information Security (Graduate University of Chinese Academy of Sciences) Beijing 100049 China 2. State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China

A threshold proxy quantum signature scheme with threshold shared verification is proposed. An original signer could authorize a group as its proxy signers. Then only t or more of n persons in the proxy group can generate the proxy signature on behalf of the original signer and any t-1 or fewer ones cannot do that. When the proxy signature needs to be verified,any t or more of n persons belonging to the verification group can verify the message and any t-1 or fewer ones cannot verify the validity of the proxy signature.

关键词： quantum signature threshold proxy quantum group signature threshold shared verification

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MPMAC and its security analysis

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beijing Gongye Daxue Xuebao / Journal of beijing University of technology 2008年第SUPPL. 2期34卷 62-66页

作者： Zhang, Shao-Lan Yang, Yi-Xian Xing, Guo-Bo 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 Defense Technology of MOE Beijing University of Posts and Telecommunications Beijing 100876 China School of Computer Science and Technology Shandong Jianzhu University Jinan 250101 China

According to the weakness of mode of operation, a modified parallelizable message authentication code (MPMAC) is proposed. The mode to process the last block of message is improved to avoid the forgery attack with random message by using the fact that the block cipher has same output with the same input using a key. Its security is proved by quantifying the advantage of distinguishing message authentication code from the random function in terms of the quality of the block cipher as a pseudo-random permutation.

关键词： Authentication

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Action-Based Access Control Modelt

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电子学报(英文版) 2008年第3期17卷 396-401页

作者： LI Fenghua WANG Wei MA Jianfeng Sang JaeMoon Key Laboratory of Computer Networks and Information Security (Ministry of Education) Xidian University Xi＇an 710071 China) Graduate School Beijing Electronic Science and Technology Institute Beijing 100070 China) Mobile Network Security Technology Research Center Kyungpook National UniversitySankyuk-dong~ Buk-ku~ Daeyu 702-701~ KoreaI

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A VSC-HVDC fuzzy controller to damp oscillation of AC/DC power system

A VSC-HVDC fuzzy controller to damp oscillation of AC/DC pow...

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IEEE International Conference on Sustainable Energy Technologies, ICSET

作者： Chunye Li Sheng Li Fuchun Han Jingfu Shang Ermin Qiao College of Electrical and Power Engineering Taiyuan University of Technology Taiyuan China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education Beijing China China Electrical Power Research Institute China

The fast control capability of the VSC-HVDC and the process of area mode oscillations are analyzed. An auxiliary fuzzy logic controller designed in Matlab for the voltage source converter based HVDC transmission system, VSC-HVDC, to improve the stability of the AC/DC system is designed to enhance stability by increasing the deceleration energy of oscillation. Simulation results on the IEEE 4-generator AC/DC power systems have shown that the controller can enhance the dynamic stability of interconnected power systems effectively and is robust to the variation of system operating conditions and oscillation modes.

关键词： Fuzzy control Fuzzy systems Control systems Power systems Power system stability Converters Power conversion Power system simulation Power system interconnection Power system dynamics

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Multi-target controller of three-level NPC based VSC-HVDC transmission system and Its RTDS simulation

Multi-target controller of three-level NPC based VSC-HVDC tr...

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IEEE International Conference on Sustainable Energy Technologies, ICSET

作者： Jianhua Zhang Sheng Li Jingfu Shang Weiwei Zhao Chunye Li Department of Electrical Engineering the School of Electrical and Electronic Engineering North China Electric Power University Beijing China Key laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education Beijing China College of Electrical and Power Engineering Taiyuan University of Technology Taiyuan China

This paper builds the dynamic mathematic model of the three-level Neutral Point Diode Clamped (NPC) converter, discusses the fundamental principles of the active and reactive power control for three-level Voltage Source Converter based HVDC (VSC-HVDC) system. To fully utilize the controllability of VSC-HVDC, multi-target controller is developed to control AC and DC system respectively. Improved sine wave PWM (ISPWM) technique is designed to raise the DC voltage utility rate. Real time digital simulation (RTDS) is done to verify the validity of the proposed control strategy and controllers and demonstrate the good performance of VSC-HVDC.

关键词： Converters Power conversion Control systems Pulse width modulation Mathematics Mathematical model Power system modeling Diodes Reactive power control HVDC transmission

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Secure AODV Routing Protocol Using SL Multi-Signcryption

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电子学报(英文版) 2007年第2期16卷 311-314页

作者： ZHANG Chuanrong YIN Zhonghai ZHANG Yuqing XIAO Guozhen Telecommunication Engineering Institute A irforce Engineering University Xi ＇ an 710077 China National Computer Network Intrusion Protection Center GUCAS Beijing 100049 China State Key Laboratory of Integrated Service Networks Xidian University Xi＇an 710071 China The Ministry of Education Key Laboratory of Computer Network and Information Security Xidian University Xi＇an 710071 China

Routing security is an important issue in secure ad hoc networks, and it appears to be a problem that is not trivial to solve. In this paper, we consider secure routing protocol and applied new cryptographic mechanism: multi-signcryption to routing protocol for ad hoc networks. SL multi-signcryption scheme efficiently provides message flexibility, order flexibility, message verifiability, order verifiability, message confidentiality, message unforgeability, non-repudiation and robustness. It is suitable for protecting messages and multi-signers from malicious attacks in networks. For this reason, using SL multi-signcryption, we propose a new secure AODV (Ad hoc on-demand distance vecter) routing protocol: SCRP (Signcryption based routing protocol). SCRP indeed enhances the security of AODV routing protocol and provides confidentiality, integrity, authentication, and non-repudiation to the routing message. Moreover, compared with other secure AODV, SCRP provides some other advantages such as lower computational cost and communicational overhead, flexibility of route message, and partially anonymous route.

关键词：安全AODV 路由协议 SL多重签密 ad-hoc网络

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Performance evaluation on IEEE 802.11e considering emergency calls in congested situation

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中国邮电高校学报（英文版） 2007年第z1期14卷 50-54页

作者： CUI Lu-ming OKADA Kazunori KATO Toshihiko CHEN Xing-yi Information Security Center National Institute of Information and Communications Technology Tokyo 184-8795 Japan Department of Information Network System Science The University of Electro-Communications Tokyo 182-8585 Japan States Key Laboratory of Networking and Switching Beijing University of Posts and Telecommunications Beijing 100876 China

To enhance the quality of service (QoS) support in IEE 802.11, IEEE 802.11e has been studied, which introduces the so-called hybrid coordination function (HCF). HCF includes two medium access mechanisms: contention-based channel access (EDCA), and contention-free channel access (HCCA). Although IEEE 802.11e has provided differentiated channel access mechanism, when call demand rises for important festivals such as New Year's Day or large scale natural disasters such as earthquakes, the delay of voice will increase and the QoS of voice nodes will drop down rapidly. Through our simulation study, in order to guarantee the QoS of emergency voice calls in congested situation, a higher priority for these calls will be required.

关键词： IEEE 802.11e EDCA HCCA HCF emergency call wireless LAN (WLAN) congested situation QoS

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Study of image recognition used for unattended substation

Study of image recognition used for unattended substation

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2006 International Conference on Power System technology, POWERCON2006

作者： Jun, Yang Xin, Ai Xiufang, Jia Yansong, Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Deshengmenwaizhuxinzhuang Beijing 102206 China Electric Power Company of Jinzhou Engineering Technology Department Liaohe Petroleum Exploration Bureau Linghai City Liaoning Province 121209 China

ISBN: (纸本)1424401119

It is a trend to construct unattended substation in power system *** paper systematically analyses the superiority and limitation of MATLAB and Visual C++ and illustrates how to compile m-files to cpp-files by MATLAB engines and integrate cpp-files code into existing C++ projects by Visual C++ to realize intelligent function on image recognition used for unattended substation. The intelligent function can effectively test illegal intrusion and fires through the detection and recognition of moving goals by three-image difference method and self-adapting threshold value segmentation algorithm and detect situations of disconnection link by use of image crop and image index processing and give warnings to alarm system. Because of lacking of brightness of image or nonlinear brightness and being influenced by kinds of noise,this paper determines to adopt contrast enhanced algorithm and high-frequency enhanced algorithm to repair grey-scale distribution and uses median filtering to remove noise of *** the end,this paper brings forward the expectation about the image recognition of the unattended substation. When non-uniform of image illumination distribution, grey-scale of background changes largely and image segmentation has not the fittest threshold, so the paper uses self-adapting threshold segmentation algorithm to gain the image segmentation. © 2006 IEEE.

关键词： Image recognition

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Research on identifiability of equivalent motor in composite load model

Research on identifiability of equivalent motor in composite...

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2007 IEEE Lausanne POWERTECH

作者： Ma, Jin Han, Dong He, Renmu Dong, Zhaoyang Hill, David J. IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University 102206 Beijing China School of Information Technology and the Electrical Engineering University of Queensland St. Lucia QLD 4072 Australia Department of Information Engineering Australian National University

ISBN: (纸本)9781424421909

Load modeling is very important for power system dynamic analysis and control. The composite load model widely applied recently in the power system operation centre consists of the static load and the equivalent motor. Current practices in measurement-based load modeling identify all the parameters in this composite load model. However, it is not clear whether all these parameters could be identified from the measurements. This paper investigates the identifiability of the equivalent motor parameters in the composite load model. Trajectory sensitivity approach is applied first to find the motor parameters that have great effects on the measured active as well as reactive load dynamics. The analysis results show that the motor outputs have various sensitivities with respect to the parameters. Since the voltage disturbance, the active load and the reactive load dynamics are applied to identify the motor parameters, those parameters affecting the measurements to a great extent are observable, thus identifiable from the measurements;while those that have little effects on the motor outputs are unobservable from the measurements and consequently unidentifiable. The case studies verify the identifiability of the motor parameters. ©2007 IEEE.

关键词： Parameter estimation

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