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International Journal of Digital Content technology and its Applications 2011年第9期5卷 80-87页

作者： Wang, Can Qin, Zhiguang Yang, Lei Nie, Peng School of Computer Science and Engineering University of Electronic Science and Technology of China Chengdu 611731 China Network and Data Security Key Laboratory of Sichuan Province Chengdu 611731 China

To improve the deduplication performance while keep a reasonable metadata cost and time cost at the same time, a state deduplication method based on variable-size sliding window and a universal model of performance-analyzing for the deduplication methods are proposed. According to this method, the data object is divided into non-overlapped mini chunks based on its content firstly, and then a variable-size sliding window, which uses the mini chunks as its basic unit of movement, is used to identify the duplicate data blocks. Further more, different chunking strategies are used on the data changing regions and the non-changing regions respectively. The theoretical analyzing indicates that this method can achieve satisfying deduplication performance even with a relatively larger expected chunk size, because it can reduce the metadata cost effectively and identify smaller duplicate data blocks. The experimental results on real data show that the average compression ratio of the method can be increased 13.02% than SWC, which has the optimal deduplication performance among the current deduplication methods. Moreover, the average time cost of this method is reduced 97.45% than SWC. This method is suitable for the applications of mass data backup in network environment, which have more rigorous requirements on the deduplication performance and the time cost.

关键词： Metadata

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Chinese sentence correlation analyzing based on semantic dependency method

Chinese sentence correlation analyzing based on semantic dep...

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International Conference on Electronics, Communications and Control (ICECC)

作者： Haiping Zhu Yang Yang Yan Chen Qian Ma Department of Computer Science and Technology Shaanxi Province Key Laboratory of Satellite and Terrestrial Network Technology Research and Development Ministry of Education Key Laboratory for Intelligent Networks and Network Security Xian Jiaotong University Xian China Department of Computer Science and Technology Xian Jiaotong University Xian China

Based on the adoption of dependency grammar to analyze the structure of Chinese sentences, this paper suggests to analyze Chinese sentence with semantic dependency method. The correlation between words and phrases can be gotten by way of analysis and calculation of the similarity between the words and phrases from How net, and then the formula to analyze the similarity between sentences can be designed. Fully considering the relationship between structure and semantics of Chinese sentences, this methodology can be adopted to analyze the correlation between topics and to categorize them. It has certain prospect in the field of Chinese language research, personalized online education and recommendation of resources for the users.

关键词： Semantics Educational institutions Correlation Computational modeling Computer science Grammar Intelligent networks

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The design and FPGA implementation of FSM-based intellectual property watermark algorithm at behavioral level

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Information technology Journal 2011年第4期10卷 870-876页

作者： Liang, Wei Sun, Xingming Ruan, Zhiqiang Long, Jing Hunan Provincial Key Laboratory of Network and Information Security Hunan University Changsha 410082 China School of Computer Science and Engineering Hunan University of Science and Technology Xiangtan 411201 China

A Finite State Machine (FSM)-based Intellectual Property (IP) watermark algorithm at behavioral level is presented for the protection of IP reuse techniques in Very Large Scale Integration (VLSI). The proposed algorithm extracts the maximal delay state set through state transformation relations among circuit signals. The watermark is mapped intoadditional delay constraint sequence by constraint generator, and the value in the sequence is added into the maximal delay state set in the circuit for embedding watermark. The algorithm is tested on Virtex XC V600-6bg432 Field-Programmable Gate Array (FPGA), theexperimental results show that the algorithms has lower impact on logical function, ensures better security and lower (resource) overhead in comparison with other methods. © 2011 Asian network for Scientific Information.© 2011 Asian network for Scientific Education.

关键词： Field programmable gate arrays (FPGA)

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Constructions of two-output Bent functions

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Journal of Computational Information Systems 2011年第12期7卷 4178-4184页

作者： Zhang, Fengrong Hu, Yupu Zhao, Yongbin Xie, Min Key Laboratory of Computer Network and Information Security Ministry of Education Xidian University Xi'an 710071 China School of Information Science and Technology Shijiazhuang Tiedao University Shijiazhuang 050043 China

Bent functions, which have the highest nonlinearity, play an important role in coding theory, sequence design and cryptography. On the basis of a given 2n-variable Maiorana-McFarland (M-M) Bent function and the 2n × 2n Orthomorphic Latin Square, we put forward a method to construct Bent functions on 2n variables. Furthermore, it is shown that an arbitrary constructed 2n-variable Bent function and the given 2n-variable Bent function can compose a two-output Bent function on 2n variables. At last, we count the number of the constructed two-output Bent functions on 2n variables. Copyright © 2011 Binary Information Press.

关键词： Boolean functions

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Provably secure role-based encryption with revocation mechanism

Provably secure role-based encryption with revocation mechan...

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作者： Zhu, Yan Hu, Hong-Xin Ahn, Gail-Joon Wang, Huai-Xi Wang, Shan-Biao Institute of Computer Science and Technology Peking University Beijing 100871 China Beijing Key Laboratory of Internet Security Technology Peking University Beijing 100871 China School of Computing Informatics and Decision Systems Engineering Arizona State University Tempe AZ 85287 United States 4School of Mathematical Sciences Peking University Beijing 100871 China

Role-Based Encryption (RBE) realizes access control mechanisms over encrypted data according to the widely adopted hierarchical RBAC model. In this paper, we present a practical RBE scheme with revocation mechanism based on partial-order key hierarchy with respect to the public key infrastructure, in which each user is assigned with a unique private-key to support user identification, and each role corresponds to a public group-key that is used to encrypt data. Based on this key hierarchy structure, our RBE scheme allows a sender to directly specify a role for encrypting data, which can be decrypted by all senior roles, as well as to revoke any subgroup of users and roles. We give a full proof of security of our scheme against hierarchical collusion attacks. In contrast to the existing solutions for encrypted file systems, our scheme not only supports dynamic joining and revoking users, but also has shorter ciphertexts and constant-size decryption keys. © 2011 Springer Science+Business Media, LLC & Science Press, China.

关键词： Access control

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computing Parametric Alignment of RNA Structures: Visualization and Practice

Computing Parametric Alignment of RNA Structures: Visualizat...

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International Conference on Future Computer Sciences and Application (ICFCSA)

作者： Wangsen Feng Bei Zhang Lusheng Wang Key Laboratory of Network and Software Security Assurance of Ministry of Education Computing Center Beijing University Beijing China Department of Computer Science City University of Hong Kong Hong Kong China

Alignment of RNA structures is very important in biological research. Similar to pair-wise sequence alignment, there is often disagreement about how to weight matches, mismatches, indels and gaps when comparing two RNA structures. Here, we develop a visual tool for computing parametric alignment of two RNA structures. With this tool, users can see explicitly and completely the effect of parameter choices on the optimal alignments of RNA structures. The software is available for academic use (http://***/~lwang/software/ParaRNA/).

关键词： RNA Algorithm design and analysis Software algorithms Software Periodic structures Computer science

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A distributed intrusion detection system against flooding denial of services attacks

A distributed intrusion detection system against flooding de...

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作者： Chuiyi, Xie Yizhi, Zhang Yuan, Bai Shuoshan, Luo Qin, Xu School of Mathematics and Information Science ShaoGuan University Guangdong China Information Security Center Beijing University of Posts and Telecommunications Beijing China School of Electronics and Information Engineering Liaoning University of Technology China Tianjin Key Laboratory of Intelligence Computing and Novel Software Technology Tianjin University of Technology Tianjin China Beijing Safe-Code Technology Co. Ltd. China

ISBN: (纸本)9788955191554

A DIDS(Distributed Intrusion Detection System) named as F-DIDS is built to defend against flooding DoS(Denial of Services) attacks in the paper. F-DIDS is composed of F-IDSes which are settled in nodes who need to be protected. F-DIDS is a complete DIDS, in which each node with F-IDS can be the detection centre. Due to no central node, single failure can be avoided in F-DIDS. In F-DIDS, Traffic tables help to build up traffic matrixes. By analyzing traffic matrixes, flooding DoS attacks could be detected and three normal flooding DoS attacks are classified. Local and global communication methods are proposed to reduce the overhead brought from fully distributed architecture. The simulation results and performance analysis show that F-DIDS works effectively. © 2011 Global IT Research Inst.

关键词： Denial-of-service attack

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Chaotic Hash Function Based on Tandem-DM Construction

Chaotic Hash Function Based on Tandem-DM Construction

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IEEE International Conference on Trust, security and Privacy in computing and Communications (TrustCom)

作者： Li Gao Xiaomin Wang Wenfang Zhang School of Information Science & Technology Southwest Jiaotong University Chengdu China Key Laboratory of Information Security & National Computing Grid Southwest Jiaotong University Chengdu China

Conventional chaotic hash functions adopt a number of iterations of chaotic map and a large number of floating point calculations, thus the implement of these hash functions require a great many resources. This kind of hash functions are hard to implement on the equipments which have limited resources, such as mobile phone and smart cards. In this paper, a novel hash algorithm is proposed which combines the advantage of both chaotic system and Tandem-DM compression structure. The proposal follows the usual Merkle-Damgard construction while compression function adopts the Tandem DM compression structure. Block cipher used in the Tandem DM compression function is replaced by the discretized chaotic map network (DCMN). The proposed hash function runs in the integer field and needs fewer computations. Compared with other chaotic hash functions, the algorithm inherits the efficiency of the conventional hash function while improves the security of hash function. Theoretical and simulation results show that the proposed hash algorithm has strong diffusion and confusion capability and good collision resistance, as required by practical hash functions.

关键词： Chaotic communication Resistance Cryptography Educational institutions Complexity theory

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Conditions of parameter identification from time series

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Physical Review E 2011年第3期83卷 036202-036202页

作者： Haipeng Peng Lixiang Li Yixian Yang Fei Sun Information Security Center State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications P.O. Box 145 Beijing 100876 China Key Laboratory of Network and Information Attack and Defence Technology of MOE Beijing University of Posts and Telecommunications Beijing 100876 China and National Engineering Laboratory for Disaster Backup and Recovery Beijing University of Posts and Telecommunications Beijing 100876 China

We study the problem of synchronization-based parameters identification of dynamical systems from time series. Through theoretical analysis and numerical examples, we show that some recent research reports on this issue are not perfect or even incorrect. Long-time full rank and finite-time full rank conditions of Gram matrix are pointed out, which are sufficient for parameters identification of dynamical systems. The influence of additive noise on the proposed parameter identifier is also investigated. The mean filter is used to suppress the estimation fluctuation caused by the noise.

关键词： TIME series analysis SYNCHRONIZATION DYNAMICAL systems FLUCTUATIONS (Physics) NUMERICAL analysis

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Efficient RFID authentication scheme with high security

Efficient RFID authentication scheme with high security

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International Conference on Communication Software and networks, ICCSN

作者： Shuai Shao Guoai Xu Yanfei Liu Key Laboratory of network and information attack & defence technology of MOE Beijing University of Posts and Telecommunications Beijing China First Research Institute of Ministry of Public Security Beijing China

With the spread of RFID technology, Lots of authentication schemes for RFID have been proposed to provide user privacy and security. However, most of these protocols are limited in scalability, in which the server's efficiency declines rapidly while the number of tags grows. In support of scalability, some efficient schemes are suggested recently. Unfortunately, these previous schemes have various shortcomings. This paper presents a new efficient RFID authentication scheme with strong security and privacy. The proposed scheme is suitable for managing a large number of tags, for taking constant time to authenticate a tag by using hash chain. Meanwhile, this scheme can resists tag information leakage, tag location tracking, backward traceability, forward traceability, replay attacks, denial of service attacks and other common attacks. The scheme also requires less tag-side computation than existing protocols and requires less communication.

关键词： Radiofrequency identification Cryptography Servers

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