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Congress on Image and Signal Processing, CISP

作者： Li Zhang Er-yong Wu School of Computer Science Hangzhou Dianzi University Hangzhou China Zhejiang Provincial Key Laboratory of Information Network Technology University of Zhejiang Hangzhou China

By analyzing the characteristics of off-road images, a new and computationally efficient algorithm of road segmentation and road type identification for autonomous land vehicle (ALV) navigation system based on the proposed new-type histogram calculation was established. The new-type histogram is a new image, not a curve. It is also directional. It makes a statistic of the pixels under some special direction. With the histogram images, each pixel in the original image is given a threshold separately, thus the road images are correctly segmented. Moreover, the new-type histogram image could be used to identify road type. It avoids the deficiency that road images are wrongly segmented by reason that the preset road model does not fit in the real scene in the conventional methods. The proposed method does not need any extraction of the relevant information in the image (texture of the road, shadows, road edges, etc.). The method is evaluated on thousands of the cross-country road images under various lighting conditions. The experimental results demonstrate the method's accuracy, feasibility and robustness. It increases the segmentation accuracy to an extent. This would be a potentially significant contribution to the active area of road segmentation in the ALV navigation system.

关键词： Histograms Roads Image segmentation Navigation Image analysis Algorithm design and analysis Land vehicles Statistics Pixel Layout

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An Algorithm for Evaluating Credibility of CNO Intelligence information Using Bayesian Estimation

An Algorithm for Evaluating Credibility of CNO Intelligence ...

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International Conference on information Science and Engineering (ICISE)

作者： Chunhe Xia Yunyun Sun Shan Yao Songmei Zhang Xiaojian Li Key Laboratory of Beijing Network Technology Beihang University Beijing China College of Computer Science & Information Technology Guangxi Normal University Guilin China

ISBN: (纸本)9781424449095

Intelligence activity is one of the most important activities during computer network Operation (CNO) command and decision-making process. Specially, evaluation of Intelligence information credibility is the basic element of intelligence activity and process. This paper presents an algorithm evaluating credibility of intelligence information using Bayesian estimation AECIIB, applying to signal information depicting running status of CNO targets. AECIIB makes use of evaluators' past experience and prior distribution established in advance based on historical information about the same or similar target, and inducts Bayesian estimation theory into the integration of priori knowledge and posterior knowledge to adjust distributed parameter of prior distribution, which can be used to calculate credibility of targets' running status according to its probability of occurrence in prior distribution. In this paper, this algorithm is described in detail. The following experiment describes computation process of credibility evaluation in detail which proves that prior distribution can be changed along with new information and credibility of information is derived from the latest knowledge.

关键词： Bayesian methods information analysis Algorithm design and analysis Intelligent networks Laboratories computer networks Estimation theory Probability Delay information science

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On Performance-Adaptive flow control for large data transfer in high speed networks

On Performance-Adaptive flow control for large data transfer...

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IEEE International Conference on Performance, Computing and Communications (IPCCC)

作者： Xukang Lu Qishi Wu Nageswara S. V. Rao Zongmin Wang Department of Computer Science University of Memphis Memphis TN USA Computer Science & Mathematics Div Oak Ridge National Laboratory Oak Ridge TN USA Henan Key Laboratory on Information Network University of Zhengzhou Zhengzhou China

Several research and production high-performance networks now provision multi-Gbps dedicated channels to meet the demands of large data transfers in network-intensive applications. However, end users have not seen corresponding increase in application throughput mainly because (i) the existence of high-bandwidth links has shifted the congestion from the network to end hosts, and (ii) such congestion is not well handled by TCP's Additive Increase and Multiplicative Decrease algorithm. Particularly, due to the sharing with unknown background workloads, the data receiver oftentimes lacks sufficient system resources to process the arriving packets, hence leading to significant packet drops at the end system. This paper proposes a UDP-based transport method that incorporates a performance-adaptive flow control mechanism to regulate the activities of both the sender and receiver in response to system dynamics to achieve high throughput. We construct a mathematical model for the socket receive buffer and data receiving process, and employ a profiling-based method to estimate the initial receiving bottleneck rate, which is dynamically adjusted and sent back to the sender for source rate control. The sending rate is stabilized at the estimated bottleneck rate based on a stochastic approximation algorithm. We test the proposed method on a local dedicated connection and the experimental results illustrate its superior performance over existing methods.

关键词： High-speed networks Throughput Production Additives Control systems Mathematical model Sockets Stochastic processes Approximation algorithms Testing

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A practical electronic payment scheme

A practical electronic payment scheme

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International Symposium on Communications and information Technologies (ISCIT)

作者： Jingwei Liu Kyung Sup Kwak Key Laboratory of Computer Network and Information Security Ministry of Education Xidian University Xi'an China UWB Wireless Communications Research Center Inha University Incheon South Korea

ISBN: (纸本)9781424445219

In this paper, by converse using blind signature, we propose a practical electronic payment scheme for electronic commerce. This scheme is different from the existing schemes used widely in the Internet at present and it does not need the strong trust between customer and merchant. In this scheme, a semi-trusted third party (S-TTP) is introduced to provide a fair commerce environment. The S-TTP takes part in the protocol online and is not leaked any secure information about the business. Moreover, the users do not need to register to S-TTP. An advantage of the scheme is that this approach does not require the intervention of the third party in case of dispute, if one user cheats or simply crashes.

关键词： Protocols Cryptography Public key Electronic commerce Digital signatures Electronic mail Internet Laboratories computer networks information security

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Ideal Perfect Multilevel Threshold Secret Sharing Scheme

Ideal Perfect Multilevel Threshold Secret Sharing Scheme

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The Fifth International Conference on information Assurance and Security(第五届信息保障与安全国际会议)

作者： Changlu Lin Lein Harn Dingfeng Ye Key Laboratory of Network Security and Cryptology Fujian Normal University China State Key Laborat Department of Computer Science Electrical Engineering University of Missouri-Kansas CityUSA State Key Laboratory of Information Security Graduate University of Chinese Academy of SciencesChin

ISBN: (纸本)9780769537443

Shamir proposed the first (t, n) threshold secret sharing scheme. Shamir's scheme is ideal and perfect. In this paper, we propose two modifications of Shamir's secret sharing scheme. In our first modification, each shareholder keeps both x-coordinate and y-coordinate of a polynomial as private share. In our second modification, dealer uses polynomial with degree larger than the threshold value t to generate shares for a (t, n) threshold scheme. We show that these two modified schemes are ideal and perfect. Using these two modifications, we design a multilevel threshold secret sharing schemes (MTSS). We prove that the proposed scheme is secure.

关键词： Secret sharing threshold multilevel threshold secret sharing

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Monocular vision SLAM for large scale outdoor environment

Monocular vision SLAM for large scale outdoor environment

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IEEE International Conference on Mechatronics and Automation

作者： Eryong Wu Wenhui Zhou Guojun Dai Qicong Wang Zhejiang Provincial Key Laboratory of Information Network Technology University of Zhejiang Hangzhou China Department of Computer Science & Technology Hangzhou Dianzi University Hangzhou China Department of Computer Science Xiamen University Xiamen China

We present an algorithm which can realize the monocular vision simultaneous localization and mapping(SLAM) for mobile robot in the large scale outdoor environment. Unused traditional mechanic odometer sensor information, we utilize the ideas of Structure From Motion(SFM) for step-to-step motion estimation reliably only with visual information. Scale Invariant Feature Transform(SIFT) image feature is used as natural landmark, and its 3D position is constructed directly through triangulation methodology after the scale of robot's translational motion is uniquely determined. Then in the Rao-Blackwellised particle filter framework, one concurrent Extended Filter(EKF) is used as proposal density function, and the associated landmark state is updated by one EKF filter independently in the corresponding landmark map of this particle. Finally, real experiments show that our method is feasible and robust, even against large translation and large rotation movements.

关键词： Simultaneous localization and mapping Large-scale systems Particle filters Mobile robots Motion estimation Robustness computer science Proposals Density functional theory Robot vision systems

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Security Analysis of Two Remote User Authentication Schemes Using Bilinear Pairings

Security Analysis of Two Remote User Authentication Schemes ...

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International Conference on Management of e-Commerce and e-Government, ICMECG

作者： Zuowen Tan Key Laboratory of Network Security and Cryptology School of Mathematics and Computer Science Fujian Normal University Fuzhou China School of Information Technology Jiangxi University of Finance and Economics Nanchang Jiangxi China State Key Laboratory of Information Security Institute of Software of Chinese Academy of Sciences Beijing China

Recently, Das et al. and Tseng et al. proposed a remote user authentication scheme using bilinear pairings, respectively. They can provide a flexible password change option to the users without any help from the remote server. However, some weaknesses of the two bilinear pairing based remote password authentication schemes are found in the paper. The schemes suffer from offline password guessing attack and impersonation attacks.

关键词： Authentication Identity-based encryption network servers information security Elliptic curve cryptography Public key Elliptic curves computer security Galois fields computer network management

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Interested Sample Point Pre-Selection Based Dense Terrain Reconstruction for Autonomous Navigation

Interested Sample Point Pre-Selection Based Dense Terrain Re...

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International Symposium on Intelligent information Technology Application, IITA

作者： Lili Lin Wenhui Zhou College of Information and Electronic Engineering Zhejiang Gongshang University Hangzhou China Zhejiang Provincial Key Laboratory of Information Network Technology University of Zhejiang Hangzhou China College of Computer and Software Hangzhou Dianzi University Hangzhou China

This paper addresses the problem of terrain reconstruction for autonomous navigation. Dense stereo matching based terrain reconstruction methods are sensitive to mismatch pixels in disparity map, and consume lots of computation on pixels in uninterested regions. Traditional sample point pre-selection methods (SPPS) are effective, but they can only obtain sparse terrain map for grid-based representation. We extend the idea of SPPS methods and propose an interested sample point pre-selection (ISPPS) based dense reconstruction method. In this method, we choose appropriate interested sample points and set their reconstruction results as local control points, which can reduce the ambiguity and computation complexity in successive dense reconstruction procedures. The most prominent advantage of this method is it directly recovers the 3D terrain model without dense disparity map. Experiments show the proposed method is robust, and can achieve precise dense reconstruction with low computation complexity.

关键词： Navigation Image reconstruction Reconstruction algorithms Stereo image processing Educational institutions Robustness Interpolation Robot kinematics Space exploration Grid computing

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Towards a Source-Code Oriented Attestation

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China Communications 2009年第4期6卷 82-87页

作者： Ruan Anbang Shen Qingni Wang Li Qin Chao Gu Liang Chen Zhong School of Software and Microelectronics Peking University Beijing 102600 China Network and Information Security Laboratory Institute of Software School of Electronics Engineering and Computer Science Peking University Beijing 100871 China Key Laboratory of High Confidence Software Technologies of the Ministry of Education Peking University Beijing 100871 China First Research Institute of Ministry of Public Security of China Beijing 100048 China

The Binary-based attestation （BA） mechanism presented by the Trusted Computing Group can equip the application with the capability of genuinely identifying configurations of remote system. However, BA only supports the attestation for specific patterns of binary codes defined by a trusted party, mostly the software vendor, for a particular version of a software. In this paper, we present a Source-Code Oriented Attestation （SCOA） framework to enable custom built application to be attested to in the TCG attestation architecture. In SCOA, security attributes are bond with the source codes of an application instead of its binaries codes. With a proof chain generated by a Trusted Building System to record the building procedure, the challengers can determine whether the binary interacted with is genuinely built from a particular set of source codes. Moreover, with the security attribute certificates assigned to the source codes, they can determine the trustworthiness of the binary. In this paper, we present a TBS implementation with virtualization.

关键词： remote attestation trusted building system virtualization source-code

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Anonymous and authenticated routing protocol for mobile ad hoc networks

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Tongxin Xuebao/Journal on Communications 2009年第11 A期30卷 81-85页

作者： Li, Xiao-Qing Li, Hui Ma, Jan-Feng Ministry of Education Key Laboratory of Computer Network and Information Security Xidian University Xi'an 710071 China

Aimed at the anonymous of open environment of mobile ad hoc networks was not considered in the routing protocol of ARAN, and it was a low efficiency protocol in searching a routing. An new anonymous and authenticated routing protocol for mobile ad hoc networks(AARAN) was presented, It made use of hash function, signature and Hello message. The protocol can effectively ensure the anonymous of the networks, avoid launching a routing request repeatedly, so it improves the efficiency, and the protocol can availably account for the harm which is caused by selfish nodes.

关键词： Routing protocols

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