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High precision test method and apparatus for photoelectric encoder

Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of technology 2007年第11期27卷 977-980+1008页

作者： Deng, Fang Chen, Jie Chen, Wen-Jie Chi, Cheng Department of Automatic Control School of Information Science and Technology Beijing Institute of Technology Beijing 100081 China Key Laboratory of Complex System Intelligent Control and Decision School of Information Science and Technology Beijing Institute of Technology Beijing 100081 China

A new method and apparatus is proposed to improve the precision and reduce the cost of photoelectric encoder measurements. The method is based on highest resolution measurement and completely statistical analysis. The system includes a stepping motor, a high precision worm reduction gear, a high speed single chip microcomputer, a low cost incremental optical electric encoder and some multi interfaces of communication protocols. The single chip microcomputer as the lower system can test and collect the optical electric encoder. The PC computer as host-computer can deal with the test data. The precision of the system can reach 18 binary digits. Results of application in practice showed that the method and apparatus is efficient and effective, the cost of the apparatus is less than the some kind of system.

关键词： Photoelectric devices

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ID-based Ring Proxy Signatures

ID-based Ring Proxy Signatures

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IEEE International Symposium on information Theory

作者： Baodian Wei Fangguo Zhang Xiaofeng Chen Department of Electronics and Communication Engineering Guangdong Key Laboratory of Information Security Technology Sun Yat-Sen University Guangzhou Guangdong China Department of Computer Science Guangdong Key Laboratory of Information Security Technology Sun Yat-Sen University Guangzhou Guangdong China

ISBN: (纸本)9781424413973;1424413974

In this paper, by combining the functionalities of proxy signatures and ring signatures, we propose a new concept, named ring proxy signature, which is a proxy signature generated by an anonymous member from a set of potential signers. We construct two ID-based ring proxy signature schemes. The security analysis is provided as well.

关键词： Sun Laboratories information security Protection Protocols computer science Postal services Privacy Forgery Cryptography

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Society-oriented Designated Confirmer Signatures

Society-oriented Designated Confirmer Signatures

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International Conference on Natural Computation (ICNC)

The concept of society-oriented designated confirmer signatures (SDCS) is introduced in this paper. SDCS can be used in the circumstances where the capability of the signer and that of the confirmer are both needed to be shared among groups of individuals. The ways to share the signing capability and the confirming capability are different due to the different stabilities of the signer group and the confirmer group. Based on the techniques of threshold cryptography, a concrete SDCS scheme is proposed and its security is analyzed. Our scheme can also be converted into an ordinary signature scheme or a designated verifier signature scheme.

关键词： Distributed control Cryptography information security Concrete Sun Laboratories Stability Public key Design engineering computer science

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Efficient Mediated Certificates Public-key Encryption Scheme without Pairings

Efficient Mediated Certificates Public-Key Encryption Scheme...

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International Conference on Advanced information Networking and Applications Workshops (AINAW)

作者： Chen Yang Furong Wang Xinmei Wang Ministry of Education Key Laboratory of Computer Networks and Information Security Xi'an China Department of Electronics & Information Engineering Zhong University of Science and Technology Wuhan China

It has always been a critical issue to find efficient methods for fast revocation of a user's identity in traditional ID-based crypto systems. In this paper, we present an efficient mediated certificateless public-key encryption scheme (MCL-PKE for short) without using bilinear pairing. The proposed MCL-PKE scheme solves the inherent key escrow problem of traditional identity-based cryptosystems and provides instantaneous revocation property simultaneously. In addition, our scheme is IND-CCA secure against two types of adversaries in random oracle based on the hardness of the computational Diffie-Hellman problem.

关键词： Public key Identity-based encryption Public key cryptography Internet computer science education computer networks information security Data structures Authentication Identity management systems

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Research of electronic document certification testing system base on characteristics getting

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Zhongshan Daxue Xuebao/Acta Scientiarum Natralium Universitatis Sunyatseni 2007年第6期46卷 44-47页

作者： Zeng, Fan-Zhi Zhao, Hui-Min Lu, Yan-Sheng Fang, Yan-Mei Department of Computer Science Foshan University Foshan 528000 China Department of Computer Science Huazhong Univ. of Sci. and Technol. Wuhan 430074 China Guangdong Key Laboratory of Information Security Technology Sun Yat-Sen University Guangzhou 510275 China

In the web environment, there is a novel algorithm of electronic documents falsification, which uses the document whole characteristics getting to certify the reliability of the information. To avoid malicious attacks, the algorithm extracts various statistic characteristics of the document, and utilizes the characteristics getting for security and falsification. The results show that the method can differentiate all kinds of electronic documents truthfulness.

关键词： Electronic document identification systems

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Towards Improving Ant-Based Clustering - An Chaotic Ant Clustering Algorithm

Towards Improving Ant-Based Clustering - An Chaotic Ant Clus...

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International Conference on Computational Intelligence and security Workshops (CISW)

作者： Xiaofang Huang Yixian Yang Xinxin Niu Information Security Center State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications China Department of Computer Science Southwest University of Science and Technology China

Ant-based clustering as a nature-inspired heuristic algorithm has been applied in a data-mining context to perform both clustering and topographic mapping. It is derived from a basic model of behavior observed in real ant colonies. Early works demonstrated some promising characteristics of the ant-based clustering, but they did not extend to improve its performance, stability, convergence, and other key features. In this paper, we describe an improved version, called CACAS, adopting an important strategy of using chaotic perturbation to improve individual quality and utilized chaos perturbation to avoid the search being trapped in local optimum. We compare its performance with the K-means approach and ant-based clustering by evaluation functions and topographic mapping using a set of analytical data. Our results demonstrate CACAS is a robust and viable approach.

关键词： Chaos Clustering algorithms Content addressable storage information security computer science Data analysis Robustness Partitioning algorithms Computational intelligence computer security

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A New Prime-Phase Sequence Family with Low Correlation and Large Size

A New Prime-Phase Sequence Family with Low Correlation and L...

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第三届信号设计及其在通信中的应用国际会议(Proceedings of 2007 International Workshop on Signal Design and Its Applications in Communications IWSDA'07)

作者： Nigang SUN Lei HU Li LU Xuyun NIE Department of Computer Science and Engineering East China University of Science and Technology Sha State Key Laboratory of Information Security Graduate University of Chinese Academy of Sciences Be Department of Computer Science and Engineering Hong Kong University of Science and Technology Kowl School of Computer Science and Engineering University of Electronic Science and Technology of China

A new family of p-phase low-correlation sequences with large family size, where p is an odd prime,is constructed by using the highest coordinate of linear recurrence sequences over the ring Zp1, for l ≥2. Utilizing Galois ring theory (the local Weil bound) and spectral analysis over the additive group of Zp1, we derive an estimate of the correlation of the sequences.

关键词： correlation Galois ring highest coordinate.

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Dynamic key-Updating: Privacy-Preserving Authentication for RFID systems

Dynamic Key-Updating: Privacy-Preserving Authentication for ...

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IEEE International Conference on Pervasive Computing and Communications (PerCom)

作者： Li Lu Jinsong Han Lei Hu Yunhao Liu Lionel M. Ni State Key Laboratory of Information Security Graduate School of Chinese Academy of Sciences China Department of Computer Science and Engineering Hong Kong University of Science and Technology Hong Kong China

The objective of private authentication for radio frequency identification (RFID) systems is to allow valid readers to explicitly authenticate their dominated tags without leaking tags' private information. To achieve this goal, RFID tags issue encrypted authentication messages to the RFID reader, and the reader searches the key space to locate the tags. Due to the lack of efficient key updating algorithms, previous schemes are vulnerable to many active attacks, especially the compromising attack. In this paper, we propose a strong and lightweight RFID private authentication protocol, SPA. By designing a novel key updating method, we achieve the forward secrecy in SPA with an efficient key search algorithm. We also show that, compared with existing designs, SPA is able to effectively defend against both passive and active attacks, including compromising attacks. Through prototype implementation, we observe that SPA is practical and scalable in current RFID infrastructures

关键词： Authentication Radiofrequency identification Cryptography information retrieval Databases Protocols RFID tags Protection Privacy Laboratories

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Collaborative filtering recommendation algorithm based on cloud model

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Ruan Jian Xue Bao/Journal of Software 2007年第10期18卷 2403-2411页

作者： Zhang, Guang-Wei Li, De-Yi Li, Peng Kang, Jian-Chu Chen, Gui-Sheng State Key Laboratory of Software Development Environment Beihang University Beijing 100083 China Institute of Electronic System Engineering Beijing 100840 China Information Security Center Shenzhen Graduate School Harbin Institute of Technology Shenzhen 518055 China School of Computer Science and Technology Shandong Jianzhu University Ji'nan 250101 China

Recommendation system is one of the most important technologies applied in e-commerce. Similarity measuring method is fundamental to collaborative filtering algorithm, and traditional methods are inefficient especially when the user rating data are extremely sparse. Based on the outstanding characteristics of Cloud Model on the process of transforming a qualitative concept to a set of quantitative numerical values, a novel similarity measuring method, namely the likeness comparing method based on cloud model (LICM) is proposed in this paper. LICM compares the similarity of two users on knowledge level, which can overcome the drawback of attributes' strictly matching. This work analysis traditional methods throughly and puts forward a novel collaborative filtering algorithm, which is based on the LICM method. Experiments on typical data set show the excellent performance of the present collaborative filtering algorithm based on LICM, even with extremely sparsity of data.

关键词： Electronic commerce

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A NEW APPROACH TO MULTILEVEL security BASED ON TRUSTED COMPUTING PLATFORM

A NEW APPROACH TO MULTILEVEL SECURITY BASED ON TRUSTED COMPU...

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2007 International Conference on Machine Learning and Cybernetics(IEEE第六届机器学习与控制论国际会议)

作者： XIAO-DONG ZUO FENG-MEI LIU CHAO-BIN MA State Key Laboratory of Information Security Graduate School of Chinese Academy of Sciences Beijing Department of Information Research College of Information Engineering Information Engineering Univ College of Computer Science Beijing University of Technology Beijing 100022China

To achieve the multilevel security goal some models bad been developed such as BLP since *** models can't successfully work in network environment nowadays due to the difficulty to make the labels of subjects and objects unaltered across different *** years many researchers put forward cryptographic solutions to address multilevel security *** the key management schemes in real systems were always difficult problems that made those solutions *** trusted computing technologies are great advancement in computer architecture and should be a powerful tool to securely manage the *** paper proposes a new approach on the base of the capabilities provided by TPM (Trusted Platform Module) to implement a sound cryptographic *** new approach enforces a mandatory access control policy in network environment and is especially suited for classified organizations.

关键词： Multilevel security Trusted computing Access control Hierarchy

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