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Construction of Odd-Variable Boolean Function with Maximum Algebraic Immunity Using Univariate Polynomial Representation

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China Communications 2012年第10期9卷 33-39页

作者： Zhao Wentao Fu Shaojing Li Chao Qu Longjiang College of Computer National University of Defense Technology Changsha 410073 P. R. China Department of Mathematics and System Science National University of Defense Technology Changsha 410073 P. R. China Key Laboratory of Network Security and Cryptology Fujian Normal University Fuzhou 350007 P. R. China State key Laboratory of Information Security Chinese Academy of Science Beijing 100049 P. R. China

To protect against algebraic attacks, a high algebraic immunity is now an important criterion for Boolean functions used in stream ciphers. In this paper, a new method based on a univariate polynomial representation of Boolean functions is proposed. The proposed method is used to constmct Boolean functions with an odd number of variables and with maximum algebraic immunity. We also discuss the nonlinearity of the constructed functions. Moreover, a lower bound is deter- mined for the number of Boolean functions with rmximum algebraic immunity.

关键词： cryptography boolean function alge- braic attack algebraic immunity

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A bilateral secure threshold signature scheme with distinguished signing authorities

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International Journal of Advancements in Computing technology 2012年第8期4卷 100-107页

作者： Lize, Gu Feng, Wang Yousheng, Zhou Shi-hui, Zheng Information Security Center State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China Mathematic Department of Dezhou University Dezhou 253023 China Chongqing University of Posts and Telecommunications Chongqing 400065 China Key Laboratory of network and information attack and defence technology of MOE Beijing University of Posts and Telecommunications Beijing 100876 China

Forward secure threshold signature plays an important role in distributed signature. In order to enhance the security and efficient of the forward secure threshold signature, a new forward secure threshold signature is proposed. The proposed scheme achieves not only the forward security but also the backward security for the threshold signature. The disclosure of group secret key or individual secret keys can not threat the signature security of all time period. Instead of signing the whole document, the group members only sign a smaller part by themselves in the scheme. The size of a group signature is equivalent to that of any individual signature. Such an approach achieves the justification of labor-division and responsibility-sharing inherent in the group works. Moreover, the bandwidth of data transmission for group signature construction can be further reduced. Analysis shows that the proposed scheme is more secure and efficient.

关键词： Distinguished Signing Authorities Forward security Group-oriented Threshold Signature

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Identity-based proxy cryptosystems with revocability and hierarchical confidentialities

Identity-based proxy cryptosystems with revocability and hie...

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作者： Wang, Lihua Wang, Licheng Mambo, Masahiro Okamoto, Eiji Network Security Research Institute Koganei-shi 184-8795 Japan State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China Faculty of Electrical and Computer Engineering Institute of Science and Engineering Kanazawa University Kanazawa-shi 920-1192 Japan School of Systems and Information Engineering University of Tsukuba Tsukuba-shi 305-8573 Japan

Proxy cryptosystems are classified into proxy decryption systems and proxy re-encryption systems on the basis of a proxy's role. In this paper, we propose an ID-based proxy cryptosystem with revocability and hierarchical confidentialities. In our scheme, on receiving a ciphertext, the proxy has the rights to perform the following three tasks according to the message confidentiality levels of the sender's intention: (1) to decrypt the ciphertext on behalf of the original decryptor;(2) to re-encrypt the ciphertext such that another user who is designated by the original decryptor can learn the message;(3) to do nothing except for forwarding the ciphertext to the original decryptor. Our scheme supports revocability in the sense that it allows proxy's decryption and re-encryption rights to be revoked even during the valid period of the proxy key without changing the original decryptor's public information. We prove that our proposal is indistinguishable against chosen identity and plaintext attacks in the standard model. We also show how to convert it into a system against chosen identity and ciphertext attacks by using the Fujisaki-Okamoto transformation. © 2012 The Institute of Electronics, Information and Communication Engineers.

关键词： Cryptography

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A Survey on Problems in Smart Grid with Large Capacity Wind Farm Interconnected

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Energy Procedia 2012年 17卷 776-782页

作者： Yang Peihong Liu Wenying Wei Yili School of Information Engineering Inner Mongolia University of Science and Technology Baotou China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Under Ministry of Education North China Electric Power University Beijing China

The basic concepts and development of smart grid is described. The influence of large capacity wind farm interconnected on the smart grid is analyzed particularly, following contents are emphatically presented: model of wind farm, basic operation performance, output forecasting of wind farm, power flow in smart grid including wind farm, balance of voltage and raeactive power, small disturbance stability, transient stability, faults and reliability, etc., in the hope of offering references for the fast development of smart grids absorbing more capacity of wind power.

关键词： smart grid power system wind farm stability

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Analysis on Token-Controlled Public key Encryption

Analysis on Token-Controlled Public Key Encryption

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International Conference on Mobile Ad-hoc and Sensor networks, MSN

作者： Changlu Lin Yong Li Sriramkrishnan Srinivasan Li Lu Key Laboratory of Network Security and Cryptology Fujian Normal University Fuzhou China Key Laboratory of Communication & Information Systems Beijing Municipal Commission of Education Beijing Jiaotong University Beijing China Department of Computing University of Surrey Guildford UK School of Computer Science University of Electronic Science and Technology Chengdu China

ISBN: (纸本)9781467358088

In this paper, we analyze on the use of token-controlled public key encryption (TCE)schemes. We argue that for many of the applications in some possibilities of application in financial or legal scenarios, for example, the millionaire's will problem, the `private-opening' commitment, the scheduled payment problem, and the sealed-bid auctions and electronic lotteries problem, in the literature, the use of token-controlled public key encryption on its own, leads to inadequate solutions. We suggest that when considering applications of TCE, it is advisable to pay close attention to the lack of authentication and incorporate defences against the problems highlighted in this paper.

关键词： Public key encryption Token-controlled public key encryption Authentication security and privacy Public key encryption Authentication Trichloroethylene

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A secure message delivery scheme with path tracking for delay tolerant networks

A secure message delivery scheme with path tracking for dela...

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IEEE International Conference on Communications in China (ICCC)

作者： Zhongtian Jia Muhammad Ali Raffay Lixiang Li Xiaodong Lin Yixian Yang Information Security Center Beijing University of Posts and Telecommunications China Shandong Provincial Key Laboratory of Network based Intelligent Computing University of Jinan Jinan China Faculty of Business and Information Technology Institute of Technology University of Ontario Oshawa ONT Canada

In delay tolerant networks (DTNs), message delivery is operated in an opportunistic way through store-carry and forward relaying, and every DTN node is in anticipation of cooperation for data forwarding from others. Unfortunately, there always exist some selfish nodes that are reluctant to contribute to this cooperative data forwarding procedure so as to save their valuable storage buffer, limited computation power and precious energy. In order to stimulate nodes' willingness to participate in data forwarding, a number of incentive schemes have been proposed recently. However, most existing incentive schemes simply ignore efforts of nodes involved in message delivery if messages delivered fail to reach their destinations. Due to the nature of DTN, such as intermittent connectivity, it is not unusual to have unreliable message delivery, which results in unrewarded or wasted efforts for participating nodes and may discourage them from participating in future data forwarding. Therefore, it is crucial to recognize contribution of every node involved in a data forwarding procedure even the message it helps to forward doesn't successfully reach its destination. However, how to track all delivery paths so as to give every intermediate node some incentive for their cooperative efforts of data forwarding is still an open research problem. To address this problem, we propose a secure message forwarding scheme with path tracking. The proposed method is end-to-end secure with data source and identity authentication. In addition, it can thwart some well known attacks including edge inserting attack, sibling inserting attack and free riding attack.

关键词： Nickel Public key Protocols Relays Joining processes

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A method of zero self-modification and temperature compensation for indoor air quality etection based on a software model

A method of zero self-modification and temperature compensat...

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International Conference on Control, Automation and Systems ( ICCAS)

作者： Cuiping Li Jiuqiang Han Qibin Huang Xiaoqiang Dong Xuequan Ding Yaming Ding Dianguo Hang Ning Mu Ministry of Education Key Laboratory for Intelligent Networks and Network Security Xian Jiaotong University Xian Shanxi China Beijing Institute of Pharmaceutical Chemistry Beijing China Beijing Kang Er Xing Technology Development Company Limited Beijing China Beijing Kang Er Xing Technology Development Co. Ltd. Beijing 100088 P. R. China

It is very difficult to apply non-dispersive infrared sensor to detect the indoor air quality and maintain very low zero and temperature drift over long periods. Frequently manual zero setting and calibration are required. To solve the issues of zero and temperature drift of non-dispersive infrared sensor, a software model based on zero gas intensity, reference channels intensity, standard temperature, environmental temperature, temperature drift coefficient, etc. has been established to automatically modify and compensate the zero and temperature drift existing in the long-term continuous operation of the infrared sensor. The test result and long-term application indicate the detection precision of the instrument is less than 5%F.S in various changing environmental conditions. The average detection precision of carbon dioxide has been improved from 9.26% before comprehensive processing to 1.23% after processing, while the average detection precision of methane has been improved from 10.61% before comprehensive processing to 0.70% after processing. As a result, the disadvantages existing in many gas detectors including poor stability and short calibration cycle have been overcome, thus effectively improving the detection precision and stability of the instrument and reducing the maintenance cost.

关键词： Temperature sensors Temperature measurement Temperature Infrared sensors Standards Instruments Thermal stability

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Multi-policy threshold signature with distinguished signing authorities

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The Journal of China Universities of Posts and Telecommunications 2011年第1期18卷 113-120页

作者： WANG Feng ZHOU You-sheng GU Li-ze ZHENG Shi-hui YANG Yi-xian 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 Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China

Threshold signature plays an important role to distribute the power of a single authority in modem electronic society. In order to add functions and improve efficiency of threshold signatures, a multi-policy threshold signature scheme with distinguished signing authorities is proposed. In the scheme two groups can sign and verify each other, so the scheme is two-way signing and verifying. Moreover, the threshold values of the two groups can change with the security classification of the signing document, every discretionary signatory only signs a small part of the document instead of the whole one, so the bandwidth of data transmission for group signature construction can be reduced and the size of group signature is equivalent to that of any individual signature.

关键词： threshold signature multi-policy group verified distinguished signing authorities

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Universal Three-Party Quantum Secret Sharing Against Collective Noise

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Communications in Theoretical Physics 2011年第4期55卷 589-593页

作者：杨宇光王园滕义伟温巧燕 College of Computer Science and Technology Beijing University of Technology State Key Laboratory of Integrated Services Network Xidian University State Key Laboratory of Information Security(Graduate University of Chinese Academy of Sciences) State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications

we present a robust and universal quantum secret sharing protocol with four-qubit decoherence-free （DF） states against collective noise. The transmission＇s safety is ensured by the nonorthogonality of the noiseless states traveling on the quantum channel. Although this scheme uses entangled states for encoding, only single-particle product measurements are required.

关键词： quantum secret sharing 03.67.Hk decoherence-free collective noise

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Anomaly detection of user behavior based on DTMC with states of variable-length sequences

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The Journal of China Universities of Posts and Telecommunications 2011年第6期18卷 106-115页

作者： XIAO Xi XIA Shu-tao TIAN Xin-guang ZHAI Qi-bin Graduate School at Shenzhen Tsinghua University Shenzhen 518055 China State Key Laboratory of Information Security Graduate University of Chinese Academy of Sciences Beijing 100049 China Key Laboratory of Network Science and Technology Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China

In anomaly detection, a challenge is how to model a user＇s dynamic behavior. Many previous works represent the user behavior based on fixed-length models. To overcome their shortcoming, we propose a novel method based on discrete-time Markov chains （DTMC） with states of variable-length sequences. The method firstly generates multiple shell command streams of different lengths and combines them into the library of general sequences. Then the states are defined according to variable-length behavioral patterns of a valid user, which improves the precision and adaptability of user profiling. Subsequently the transition probability matrix is created. In order to reduce computational complexity, the classification values are determined only by the transition probabilities, then smoothed with sliding windows, and finally used to discriminate between normal and abnormal behavior. Two empirical evaluations on datasets from Purdue University and AT＆T Shannon Lab show that the proposed method can achieve higher detection accuracy and require less memory than the other traditional methods.

关键词： intrusion detection anomaly detection shell command discrete-time Markov chain （DTMC）

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