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A delay guaranteed and services differentiated MAC protocol based on location and reservation in near-space

Journal of Convergence information Technology 2011年第2期6卷 120-130页

作者： Chen, Chen Gao, Xinbo Pei, Qingqi National Key Lab. of Integrated Service Networks Xidian Univ Xi'an 710071 China School of Electronic Engineering Xidian Univ Xi'an 710071 China Ministry of Edu. Key Lab. of Computer Network and Information Security Xidian Univ Xi'an 710071 China

With an ever-increasing interests and demands in Near-Space, more and more researchers have put their attentions on this field, leading to an emerging needs for modeling the 20-100km altitude space especially for broadband communications. Among the lots of works, Media Access Control (MAC) undoubtedly has chief importance and urgency with which communicating objects or nodes can effectively access to Near-Space. However, previous MAC designs mainly focus their attentions on service differentiation by application purposes without considering nodal mobility. In fact, access control for nodes with different mobility levels has significantly influences to MAC performance and is complex and difficult to be implemented together with present MAC protocols. In this paper, we first presented a location method for Near-Space vehicles such as airships and unmanned planes and then modeled the mobile networks infrastructure with mobility considered. For determining the vehicles joining/leaving events locally, we quantify the communication range with Received Signal Strength Indicator (RSSI) aid. Then, for better managing the nodes access to the Near-Space with aforementioned works, we designed a TDMA based reservation MAC protocol to guarantee the servicedelay and networks coverage with best efforts. Simulation results showed that our proposed model better fit for Near-Space mobile communication environments and presented a lower delay and higher coverage regarding to different mobility levels.

关键词： Medium access control

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Multi-user private keyword search for cloud computing

Multi-user private keyword search for cloud computing

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2011 3rd IEEE International Conference on Cloud Computing Technology and Science, CloudCom 2011

作者： Yang, Yanjiang Lu, Haibing Weng, Jian Institute for Infocomm Research Singapore Singapore Dept. of Operations Management and Information Systems Leavey School of Business Santa Clara University United States Department of Computer Science Emergency Technology Research Center of Risk Evaluation and Prewarning on Public Network Security Jinan University Guangzhou China State Key Laboratory of Information Security Institute of Software Chinese Academy of Sciences China State Key Lab. of Networking and Switching Technology Beijing University of Posts and Telecommunications China

ISBN: (纸本)9780769546223

Enterprises outsourcing their databases to the cloud and authorizing multiple users for access represents a typical use scenario of cloud storage services. In such a case of database outsourcing, data encryption is a good approach enabling the data owner to retain its control over the outsourced data. Searchable encryption is a cryptographic primitive allowing for private keyword based search over the encrypted database. The above setting of enterprise outsourcing database to the cloud requires multi-user searchable encryption, whereas virtually all of the existing schemes consider the single-user setting. To bridge this gap, we are motivated to propose a practical multi-user searchable encryption scheme, which has a number of advantages over the known approaches. The associated model and security requirements are also formulated. We further discuss to extend our scheme in several ways so as to achieve different search capabilities. © 2011 IEEE.

关键词： Outsourcing

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Comments on a threshold authenticated encryption scheme

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International Journal of computers and Applications 2011年第2期33卷 132-136页

作者： Tan, Zuowen Department of Computer Science and Technology School of Information Technology Jiangxi University of Finance and Economics Nanchang 330032 Jiangxi Province China Key Lab. of Network Security and Cryptology School of Mathematics and Computer Science Fujian Normal University Fuzhou 350007 China

An authenticated encryption scheme (AE scheme) allows the signer to generate a valid authenticated ciphertext on a message such that the designated recipient can recover the message. AE schemes can achieve confidentiality and authenticity when message is transmitted over an insecure channel. The previous AE scheme only can allow one signer to generate the authenticated ciphertext. Recently, Chung et al. proposed a (t, n) threshold authenticated encryption scheme (TAE scheme) in which any t or more signers cooperate to produce a signature for a message and no one except the designated verifier can obtain the message from the ciphertext and verify the authenticity and integrity of the message. The scheme is based on elliptic curve cryptosystem. Moreover, the scheme applies a division-of-lab.ur signature technique to reduce the load of every signer. In other words, every signer only needs to sign a message block assigned to it. Therefore, the (t, n) TAE scheme is more efficient than other AE schemes. However, some flaws of the scheme are found in this paper. Several security defects of the scheme are elab.rated: (i) It suffers from conspiracy attack. (ii) It does not hold robustness. (iii) It is insecure against insider attacks. In addition, there exist some design defects in the TAE scheme. Some measures to remove these weaknesses are given in this paper.

关键词： Authentication

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A robust and secure overlay storage scheme based on erasure coding

A robust and secure overlay storage scheme based on erasure ...

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5th International Conference on Pervasive Computing and Applications, ICPCA10

作者： Li, Chuanyou Wang, Yun School of Computer Science and Engineering Southeast University Key Lab of Computer Network and Information Integration Nanjing 210096 China

ISBN: (纸本)9781424491421

Recently, in classical P2P overlay networks, with applying replication technique, a single peer is replaced by a cluster of peers in order to tolerant Byzantine failures. In this paper, a novel robust and secure scheme for storage overlay networks is proposed by applying erasure coding technique to reduce redundancy and enhance privacy protection. For achieving a lightweight data privacy protection, encoded strips are stored and dual distinct hash functions are deployed to construct hash chains to protect location information for encoded strips. Simulation results show that with different percentage of malicious peers, by adjusting encoding parameters, the scheme is availab.e to provide durable data storage service. ©2010 IEEE.

关键词： Hash functions

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Distance estimation by constructing the virtual ruler in anisotropic sensor networks

Distance estimation by constructing the virtual ruler in ani...

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IEEE INFOCOM 2010

作者： Wang, Yun Li, Kai Wu, Jie School of Computer Science and Engineering Southeast University Key Lab. of Computer Network and Information Integration Nanjing 210096 China Department of Computer and Information Sciences Temple University Philadelphia PA 119122 United States

ISBN: (纸本)9781424458363

Distance estimation is fundamental for many functionalities of wireless sensor networks and has been studied intensively in recent years. A critical challenge in distance estimation is handling anisotropic problems in sensor networks. Compared with isotropic networks, anisotropic networks are more intractable in that their properties vary according to the directions of measurement. Anisotropic properties result from various factors, such as geographic shapes, irregular radio patterns, node densities, and impacts from obstacles. In this paper, we study the problem of measuring irregularity of sensor networks and evaluating its impact on distance estimation. In particular, we establish a new metric to measure irregularity along a path in sensor networks, and identify turning nodes where a considered path is inflected. Furthermore, we develop an approach to construct a virtual ruler for distance estimation between any pair of sensor nodes. The construction of a virtual ruler is carried out according to distance measurements among beacon nodes. However, it does not require beacon nodes to be deployed uniformly throughout sensor networks. Compared with existing methods, our approach neither assumes global knowledge of boundary recognition nor relies on uniform distribution of beacon nodes. Therefore, this approach is robust and applicable in practical environments. Simulation results show that our approach outperforms some previous methods, such as DV-Distance and PDM. ©2010 IEEE.

关键词： Anisotropy

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D-TDMA: An approach of dynamic TDMA scheduling for target tracking in wireless sensor networks

D-TDMA: An approach of dynamic TDMA scheduling for target tr...

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2010 IEEE/ACM International Conference on Green Computing and Communications, GreenCom 2010, 2010 IEEE/ACM International Conference on Cyber, Physical and Social Computing, CPSCom 2010

作者： Wang, Yun Shi, Peizhong Li, Kai Chen, Zhikui Department of Computer Science and Engineering Southeast University Key Lab. of Computer Network and Information Integration Nanjing 210096 China School of Software Technology Dalian University of Technology Dalian 116024 China

ISBN: (纸本)9780769543314

In the application of target tracking based on dynamic convey tree-based collab.ration (DCTC) in wireless sensor networks, collisions and interferences among nodes pose a challenge for data aggregation. In this paper, we refine slot allocation to the nodes in dynamic convey tree and design an energy efficient MAC protocol called D-TDMA, which avoids collisions and interferences and allocates contiguous active slots to nodes as far as possible during data aggregation from leaf nodes to a root node. As a result, the energy consumption in switching from sleeping to active state is saved. Simulation results show that D-TDMA not only gets rid of the impact of collisions and interferences among nodes in dynamic convey tree, but also performs similar throughput to that of CSMA-like mechanism where nodes work without active/sleep scheduling strategy. Our protocol outperforms ESR in both energy efficiency and low delay. © 2010 IEEE.

关键词： Time division multiple access

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Full rate and full diversity STBC in decode-and-forward relay systems

Full rate and full diversity STBC in decode-and-forward rela...

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2010 International Conference on Communications and Intelligence information Security, ICCIIS 2010

作者： Wang, Yong Li, Hui Ministry of Education Key Lab. of Computer Network and Information Security School of Telecommunications Engineering Xidian University Xi'an China

ISBN: (纸本)9780769542607

Diversity techniques are very effective tools to increase signal reception quality in Rayleigh fading channels. A novel space-time block coding method for cooperative relay networks is proposed which guarantees full diversity for any number of mobile relays with minimal delay, provided that few bits of feedback from the destination to the source and the relays are availab.e. As in the case of orthogonal space-time block codes, all transmitted symbols are separately decoded both in the relays and the destination. Therefore, decoding complexity is linear. In our proposed scheme, larger number of codes can be generated for improved coding gain. The performance of the proposed scheme is investigated for cooperative communication. It is shown that the new approach provides SNR improvement, and it is more resilient to feedback errors compared to the antenna selection technique on the basis of same number of feedback bits. © 2010 IEEE.

关键词： Cooperative communication

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Effects of image lossy compression on palmprint verification performance

Effects of image lossy compression on palmprint verification...

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2010 IEEE International Conference on information Theory and information Security, ICITIS 2010

作者： Li, Hengjian Wang, Jizhi Wang, Yinglong Zhang, Jiashu Shandong Provincial Key Laboratory of computer Network Shandong Computer Science Center Jinan China Sichuan Province Key Lab. of Signal and Information Processing Southwest Jiaotong University Chengdu China

ISBN: (纸本)9781424469406

In this paper, we investigate the effects that the lossy image compression has on the performance competitive codes of palmprint verification algorithms. Effects of lossy compression on palmprint recognition performance are of interest in applications where image storage space and transmission time are of critical importance. To reconcile that goal with its implications for bandwidth and storage, we test the effects of image lossy compression on competitive code under different transforms, quantization and encoding algorithms using a publicly availab.e palmprint database. Experiments performing recognition directly in the compressed domain show that the extracted feature template variation from the compressed palmprint image is not consistent with the image distortion. What is interesting, the effect on the JPEG is more serious than that of JPEG2000 when the compression ratio is bigger than about 11 while the effect on JPEG2000 is more serious than that of JPEG when the compression ratio is smaller than about 11. And the trellis coded quantized method is not suitable for compressing palmprint images. © 2010 IEEE.

关键词： Palmprint recognition

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Improving efficiency of security schemes in automated trust negotiation

Improving efficiency of security schemes in automated trust ...

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2nd International Workshop on Education Technology and computer Science, ETCS 2010

作者： Liu, Bailing Lu, Hongwei Zhao, Yizhu Ge, Feng College of Computer Science and Technology Huazhong University of Science and Technology Wuhan China Key Lab. of Information Network Security Ministry of Public Security Shanghai China

ISBN: (纸本)9780769539874

Automated trust negotiation (ATN) is an approach that establishes mutual trust between strangers wishing to share resources or conduct business by gradually requesting and disclosing digitally signed credentials. When designing security schemes and systems in ATN, the negotiation efficiency, which is a desirable property, is not considered sufficiently. In this paper, a useful model of P.E. evaluation is proposed to enhance negotiation efficiency by improving the efficiency of security schemes used in ATN. The useful model of P.E. evaluation is responsible for choosing a most appropriate policy among several alternative policies that can advance a negotiation at the same time, which makes the negotiation more efficient. © 2010 IEEE.

关键词： Efficiency

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Performance analysis of optimal antenna scheme in transmit diversity systems

Performance analysis of optimal antenna scheme in transmit d...

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2010 6th International Conference on Natural Computation, ICNC'10

作者： Wang, Yong Li, Hui Wang, Xiyuan Key Lab. of Computer Network and Information Security School of Telecommunications Engineering Xidian University Xi'an China Science Research Department Xidian University Xi'an China

ISBN: (纸本)9781424459612

The performance of transmit antenna selection is investigated. The exact closed-form expressions for the average BER and average SNR in MRT systems and EGT systems are proposed. The minimum number of increased transmit antennas sufficient to compensate the performance loss for using part of transmit antennas is analyzed. The validity of the performance analysis is demonstrated by computer simulation. © 2010 IEEE.

关键词： Signal to noise ratio

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