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Performance evaluation of secure concurrency control algorithm for multilevel secure distributed database system

Performance evaluation of secure concurrency control algorit...

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international conference on information technology: coding and computing (itcc)

作者： N. Kaur R. Singh A.K. Sarje M. Misra Department of Electronics and Computer Engineering Indian Institute of Technology Roorkee Roorkee Uttarakhand India

Majority of the research in multilevel secure database management systems (MLS/DBMS) focuses primarily on centralized database systems. However, with the demand for higher performance and higher availability, database systems have moved from centralized to distributed architectures, and the research in multilevel secure distributed database management systems (MLS/DDBMS) is gaining more and more prominence. Concurrency control is an integral part of database systems. Secure concurrency control algorithms proposed in literature achieve correctness and security at the cost of declined performance of high security level transactions. These algorithms infringe the fairness in processing transactions at different security levels. Though the performance of different concurrency control algorithms have been explored extensively for centralized multilevel secure database management systems, but to the best of author's knowledge the relative performance of transactions at different security levels using different secure concurrency control algorithm for MLS/DDBMS has not been reported yet. To fill this gap, this paper presents a detailed simulation model of a distributed database system and investigates the performance price paid for maintaining security with concurrency control in a distributed database system. The paper investigates the relative performance of transactions at different security levels.

关键词： Concurrency control Database systems Data security information security Multilevel systems Transaction databases Delay Distributed computing Data engineering Availability

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Optimized scheduling for data aggregation in wireless sensor networks

Optimized scheduling for data aggregation in wireless sensor...

引用

international conference on information technology: coding and computing (itcc)

作者： F. Hu X. Cao C. May Computer Engineering Department Rochester Institute of Technology Rochester NY USA Information Technology Department Rochester Institute of Technology Rochester NY USA

The most important issue in wireless sensor networks is energy consumption. To this end, many networking schemes attempt to minimize the amount of data transmitted by using data aggregation. This trades off data freshness for a savings in energy, because reports from sensor nodes that arrive at an aggregating node may have to be held there for some period of time before being reported so that additional reports may reach the aggregator from slower nodes. We propose to use an intelligent timer and some high-level knowledge of the network to implement an efficient aggregation timing control protocol. Our protocol aims to dynamically change the data aggregation period according to the aggregation quality. A request from the data sink will include the maximum latency for a certain number of reports. If this number of reports can be returned in less time than the maximum, then the maximum time will not be reached. If, however, the specified number of responses can be returned in anywhere between zero-time (instantaneous) and the maximum latency, the timing scheme will find the minimum aggregation period that satisfies the sink's request.

关键词： Intelligent networks Wireless sensor networks Timing Protocols Delay Energy consumption Intelligent sensors Network topology Processor scheduling Computer networks

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Managing a relational database with intelligent agents

Managing a relational database with intelligent agents

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international conference on information technology: coding and computing (itcc)

作者： I. Rudowsky O. Kulyba M. Kunin D. Ogarodnikov T. Raphan Institute of Neural & Intelligent Systems Department of Computer & Information Science Brooklyn College of CUNY USA Department of Neurology Mount Sinai School of Medicine USA

A prototype relational database system was developed that has indexing capability, which threads into data acquisition and analysis programs used by a wide range of researchers. To streamline the user interface and table design, free-formatted table entries were used as descriptors for experiments. This approach potentially could increase data entry errors, compromising system index and retrieval capabilities. A methodology of integrating intelligent agents with the relational database was developed to cleanse and improve the data quality for search and retrieval. An intelligent agent was designed using JACK/sup /spl trade// (Agent Oriented Software Group) and integrated with an Oracle-based relational database. The system was tested by triggering agent corrective measures and was found to improve the quality of the data entries. Wider testing protocols and metrics for assessing its performance are subjects for future studies. This methodology for designing intelligent-based database systems should be useful in developing robust large-scale database systems.

关键词： Relational databases Intelligent agent information retrieval Database systems Prototypes Indexing Yarn Data acquisition Data analysis User interfaces

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Fuzzy-based parameterized Gaussian edge detector using global and local properties

Fuzzy-based parameterized Gaussian edge detector using globa...

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international conference on information technology: coding and computing (itcc)

作者： J. See M. Hanmandlu S. Vasikarla Faculty of Information Technology Multimedia University Cyberjaya Selangor Darul Ehsan Malaysia Department of Electrical Engineering Indian Institute of Technology Delhi New Delhi India IT Department American InterContinental University Los Angeles CA USA

Many edge detection schemes suffer from the lack of image quality at the global level. Global properties are more vital in grayscale images due to loss of hue and texture. This paper proposes a novel fuzzy-based Gaussian edge detector that uses both global and local image properties for grayscale images. In the global contrast intensification phase, each pixel in an image is represented in the fuzzy domain using a modified Gaussian membership function. A nonlinear contrast intensification function containing three parameters is used to further enhance the image. In the local phase, we present a novel fuzzy parameterized Gaussian-type edge detector mask containing two fuzzifier parameters, which are chosen based on experimental selection rules. Optionally, the fuzzy image entropy function can be used to optimize all the parameters through simple gradient descent technique. In experiments conducted on various classic images, this algorithm showed notable visual improvement on both strong and weak edges in comparison with common edge detectors.

关键词： Detectors Image edge detection Filters Pixel Image processing information technology Gray-scale Gaussian processes Phase detection Entropy

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A mobile commerce framework based on Web services architecture

A mobile commerce framework based on Web services architectu...

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international conference on information technology: coding and computing (itcc)

作者： Yao-Chung Chang Jiann-Liang Chen Wen-Ming Tseng Department of Computer Science and Information Engineering National Dong Hwa University Hualien Taiwan

ISBN: (纸本)0769523153

"Mobile Internet" arguably means more than just a new technique for communication; many analysts believe that it revolutionized the business world and innovate the way individuals live. This study concentrates on switching existing e-commerce applications from the wired Internet to the mobile Internet. Web services technologies are currently the most appropriate technologies to realize e-commerce applications. This study develops a mobile commerce application framework based on Web services technologies and mobile Internet functions. To investigate the feasibility of the proposed framework, an m-store implementation is deployed in a laboratory and simulated using HTTP transactions with secure sockets layer connections in a multi-user access environment. The minimum response time is stable (0.170 seconds for 5 users, 0.196 seconds for 50 users); the maximum throughput is invariable (0.365 Mbps for 5 users, 0.317 Mbps for 50 users), and the maximum transaction rate has little variation (5.882 per seconds for 5 users, 5.102 per seconds for 50 users). Results of this study demonstrate that the proposed framework is flexible, stable and scalable.

关键词： Web services Service oriented architecture Appropriate technology Mobile communication Business communication Communication switching Web and internet services Sockets Delay Throughput

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Efficient array & pointer bound checking against buffer overflow attacks via hardware/software

Efficient array & pointer bound checking against buffer over...

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international conference on information technology: coding and computing (itcc)

作者： Zili Shao Chun Xue Qingfeng Zhuge E.H.M. Sha Bin Xiao Department of Computer Science University of Technology Dallas TX USA Department of Computing Hong Kong Polytechnic University Kowloon Hong Kong China

Buffer overflow attacks cause serious security problems. Array & pointer bound checking is one of the most effective approaches for defending against buffer overflow attacks when source code is available. However; original array & pointer bound checking causes too much overhead since it is designed to catch memory errors and it puts too many checks. In this paper, we propose an efficient array & pointer bound checking strategy to defend against buffer overflow attacks. In our strategy, only the bounds of write operations are checked. We discuss the optimization strategy via hardware/software and conduct experiments. The experimental results show that our strategy can greatly reduce the overhead of array & pointer bound checking. Our conclusion is that based on our strategy, array & pointer bound checking can be a practical solution for defending systems against buffer overflow attacks with tolerable overhead.

关键词： Buffer overflow Hardware Protection Runtime Read-write memory Optimization methods Computer science Computer security Computer bugs Computer worms

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Effective steganalysis based on statistical moments of wavelet characteristic function

Effective steganalysis based on statistical moments of wavel...

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international conference on information technology: coding and computing (itcc)

作者： Y.Q. Shi Guorong Xuan Chengyun Yang Jianjiong Gao Zhenping Zhang Peiqi Chai Dekun Zou Chunhua Chen Wen Chen New Jersey Institute of Technology Newark NJ USA University of Tongji Shanghai China

In this paper, an effective steganalysis based on statistical moments of wavelet characteristic function is proposed. It decomposes the test image using two-level Haar wavelet transform into nine subbands (here the image itself is considered as the LL/sub 0/ subband). For each subband, the characteristic function is calculated. The first and second statistical moments of the characteristic functions from all the subbands are selected to form an 18-dimensional feature vector for steganalysis. The Bayes classifier is utilized in classification. All of the 1096 images from the CorelDraw image database are used in our extensive experimental work. With randomly selected 100 images for training and the remaining 996 images for testing, the proposed steganalysis system can steadily achieve a correct classification rate of 79% for the non-blind Spread Spectrum watermarking algorithm proposed by Cox et ai, 88% for the blind Spread Spectrum watermarking algorithm proposed by Piva et ai, and 91% for a generic LSB embedding method, thus indicating significant advancement in steganalysis.

关键词： Watermarking Terrorism Spread spectrum communication Steganography Wavelet transforms Image databases System testing Data encapsulation Software algorithms Internet

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Constructing different learning paths through e-learning

Constructing different learning paths through e-learning

引用

international conference on information technology: coding and computing (itcc)

作者： Kyoung Mi Yang R.J. Ross Seong Baeg Kim Department of Computer Education National University South Korea Computer Science Department Montana State University USA

It is a challenging problem to apply an efficient teaching-learning method to the situation where learners have diverse computing backgrounds and the learning content to be covered is also in the broad coverage. In this case, it's required that more sophisticated teaching-learning method should be devised. The authors have drawn a method which can be applied to that case efficiently by using Web technology. In the authors' approach, it is focused on finding out classification methods for both learners and learning content based on the Web. To make classification and manipulation of learning content ease, learning content was recognized in order to have discrete form by introducing the concept of the knowledge unit which is extracted from each topic. Also, to make classification and diagnostic of learners ease, questions were develop to measure them and analyze each question using item response theory (IRT) on the Web. From the experiment of students sampled using the method, it is shown that learners with various backgrounds and the learning content with distribution on the broad range can be categorized effectively into several groups. Also, the authors describe how to apply the method to the introductory courses at post secondary level.

关键词： Electronic learning Computer science education Computer science Testing Educational institutions Spread spectrum communication Programming profession Educational technology Taxonomy information technology

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The N/R one time password system

The N/R one time password system

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international conference on information technology: coding and computing (itcc)

作者： V. Goyal A. Abraham S. Sanyal Sang Yong Han OSP Global Mumbai India School of Computer Science and Engineering Chung Ang University South Korea School of Technology & Computer Science Tata Institute of Fundamental Research India

A new one time password system is described which is secure against eavesdropping and server database compromise at the same time. Traditionally, these properties have proven to be difficult to satisfy at the same time and only one previous scheme i.e. Lamport hashes also called S/KEY one time password system has claimed to achieve that. Lamport hashes however have a limitation that they are computationally intensive for the client and the number of times a client may login before the system should be re-initialized is small. We address these limitations to come up with a new scheme called the N/R one time password system. The basic idea is have the server aid the client computation by inserting 'breakpoints' in the hash chains. Client computational requirements are dramatically reduced without any increase in the server computational requirements and the number of times a client may login before the system has to be reinitialized is also increased significantly. The system is particularly suited for mobile and constrained devices having limited computational power.

关键词： Computer networks Computer science Mobile computing Data engineering Databases Network servers Explosives Mission critical systems IP networks Explosions

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The BPEL orchestrating framework for secured grid services

The BPEL orchestrating framework for secured grid services

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international conference on information technology: coding and computing (itcc)

作者： P. Amnuaykanjanasin N. Nupairoj Department of Computer Engineering Chulalongkom University Bangkok Thailand

Workflow has been considered as a crucial component in several Grid projects. Among many workflow standards, BPEL, Business Process Execution Language, is emerging as a de-facto workflow standard in Grid and Web services communities. In this paper, we present the adoption of standard BPEL to orchestrate Grid services based on OGSI specification. Our approach is based on proxy services, which enable user to interact with OGSI Grid services supporting GSI security mechanisms, OGSI factory mechanism, and notification mechanism. Our proposed architecture is platform-neutral as it does not depend on any specific security architecture. With our implementation, the proxy services witl be generated automatically for each target Grid service. Thus, they are not limited to pre-defined Grid services. In addition, our proxy services also remove design-time binding limitations of BPEL and allow user to define the binding information of proxy services in run-time. As our approach utilizes original BPEL specification without special modification, we believe that developing Grid applications on our architecture will benefit from standard BPEL-compliant tools and generic Web services tools. We illustrate the example of using our proposed framework by orchestrating drug discovery processes using BPEL and Grid services.

关键词： Grid computing Web services Mesh generation information security Computer architecture Drugs Large-scale systems Engines Production facilities Runtime

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