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Security level evaluation: policy and fuzzy techniques

Security level evaluation: policy and fuzzy techniques

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

作者： V. Casola M. Rak R. Preziosi L. Troiano Dipartimento di Ingegneria dellInformazione Second University of Naples Caserta Italy RCOST Department of Engineering University of Sannio Benevento Italy

In a world made of interconnected systems that manage huge amount of confidential and shared data, security plays a significant role. Policies are the means by which security rules are defined and enforced. The ability of evaluating policies is becoming more and more relevant, especially when referred to cooperation of services belonging to untrusted domains. Here we have focused our attention on public key infrastructures (PKIs); at the state of the art security policies evaluation is expressed by means of security levels. However, policy evaluation must face uncertainty deriving from different perspectives, verbal judgments and lack of information. Fuzzy techniques and uncertainty reasoning can provide a meaningful way of dealing with these issues. We illustrate a fuzzy technique to evaluate the security level for a given policy against a set of reference policy levels.

关键词： Law information security Legal factors Digital signatures Standards organizations Data security Public key Uncertainty Data engineering Interconnected systems

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Combining the product of Interactive Multimedia Creator with MPEG4 technology

Combining the product of Interactive Multimedia Creator with...

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

作者： Zheng Xiang Zhou Bing-Feng Fang Xi-Feng Sun Jin-Wen Si Duan-Feng Institute of Computer Science & Technology Peking University Beijing China

ISBN: (纸本)0769521088

In order to enhance the functions of IMCPs (the Product of Interactive Multimedia Creator) over Internet through streaming multimedia technology., in the paper, some methods are proposed to combine IMCPs with MPEG4 technology by which IMCPs could be translated to streaming multimedia and transferred over Internet, these methods include converting the file format of IMCPs' into MP4 format, revealing chinese characters, improving QoS, extending MPEG4's support streamType and so on. These technologies have been realized by presenting a process of both converting the products of Founder Author Tool into a kind of MPEG4 file format and building a corresponding streaming media player, which further enhances the content of Founder Author Tool's products by streaming multimedia technology. On the other hand, IMC (Interactive Multimedia Creator) software can painlessly produce MPEG4 contents without learning any new content development tools, and benefit from the international standard and its interoperability.

关键词： Multimedia systems MPEG 4 Standard Streaming media Layout Digital multimedia broadcasting Paper technology Internet Standards development ISO standards Animation

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Detecting anomalies in high-performance parallel programs

Detecting anomalies in high-performance parallel programs

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

作者： G. Florez Z. Liu S. Bridges R. Vaughn A. Skjellum The Center for Computer Security Research Mississippi State University USA Department of Computer and Information Sciences University of Alabama Birmingham USA

Message passing interface (MPI) is an effective programming technique for implementing parallel programs for distributed computation. As these applications run, a number of different types of irregularities can occur including those that result from intrusions, user misbehavior, corrupted data, deadlocks or failure of cluster components. We perform a comparison of different artificial intelligence (AI) techniques that can be used to implement a lightweight monitoring and detection system for parallel applications on a cluster of Linux workstations. We study the accuracy and performance of deterministic and stochastic algorithms when we observe the flow of function library and OS system calls of parallel programs written with MPI. We demonstrate that monitoring of MPI programs can be achieved with high accuracy and in some cases with a 0% false positive rate in real-time, and we show that the added computational load on each node is small. Finally we demonstrate that simple deterministic methods perform poorly when the program flow grows in size and variety, and that more complex methods are required.

关键词： Artificial intelligence Message passing Parallel programming Computer interfaces Concurrent computing Distributed computing System recovery Condition monitoring Linux Workstations

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Component-based embedded database for mobile embedded systems

Component-based embedded database for mobile embedded system...

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

作者： S.I. Ahamed S. Vallecha Marquette University Milwaukee WI USA

Recent developments in portable devices and growing wireless communication networks have evolved mobile computing during the last few years. Mobile computing enlarges the usability of computers by allowing low powered mobile devices to query the database over the wireless network, but also raises some demanding challenges such as slow expensive connection, frequent line disconnection, limited host bandwidth, location dependent data etc. This database should not only handle transactions with temporal constraints and maintain consistency, but also use small memory footprint. The database should use the resources more efficiently, port on various operating systems, minimize CPU usage, run for long period of time without any user intervention, secure and flexible enough to work with different applications with no or less tailoring. The database should be generic and can be tailored so that the application designer can get fully functional and flexible database for mobile embedded systems. This paper proposes a mobile embedded database, which will resolve some of the important issues caused by the mobile computing environment using a component based approach.

关键词： Embedded system Mobile computing Computer networks Transaction databases Wireless communication Portable computers Usability Wireless networks Bandwidth Operating systems

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Measuring the scalability of relationally mapped semistructured queries

Measuring the scalability of relationally mapped semistructu...

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

作者： R.J. Cathey S.M. Beitzel E.C. Jensen A.J. Pilotto D. Grossman Information Retrieval Laboratory Department of Computer Science Illinois Institute of Technology Chicago IL USA

The explosive growth of XML has led to an increasing need for scalable XML retrieval systems. Our XML retrieval system, the SQLGenerator, stores XML of any schema in a fixed schema relational database and supports a full-featured semistructured query language, XML-QL, through optimized translation of its semantics to relational SQL queries. We examine the scalability of this approach with respect to increasing data size. We index four XML collections ranging in size from 500MB to 2GB that were generated using a standard XML generator, XBench. We then compare the execution times of 11 standard XBench queries, covering a wide range of semistructured query features, whose semantics were directly translatable from their original XQuery language to XML-QL. Although it is difficult to estimate the theoretical baseline for scalability of these query features in an RDBMS, many of the queries' runtimes grow linearly with respect to the size of the document collection.

关键词： Scalability XML Relational databases Database languages information retrieval Laboratories Indexes Computer science Explosives Estimation theory

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Fuzzy edge detector using entropy optimization

Fuzzy edge detector using entropy optimization

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

作者： M. Hanmandlu J. See S. Vasikarla Department of Electrical Engineering Indian Institute of Technology Delhi New Delhi India

This paper proposes a fuzzy-based approach to edge detection in gray-level images. The proposed fuzzy edge detector involves two phases - global contrast intensification and local fuzzy edge detection. In the first phase, a modified Gaussian membership function is chosen to represent each pixel in the fuzzy plane. A global contrast intensification operator, containing three parameters, viz., intensification parameter t, fuzzifier f/sub h/ and the crossover point x/sub c/, is used to enhance the image. The entropy function is optimized to obtain the parameters f/sub h/, and x/sub c/ using the gradient descent function before applying the local edge operator in the second phase. The local edge operator is a generalized Gaussian function containing two exponential parameters, /spl alpha/ and /spl beta/. These parameters are obtained by the similar entropy optimization method. By using the proposed technique, a marked visible improvement in the important edges is observed on various test images over common edge detectors.

关键词： Detectors Entropy Image edge detection Fuzzy sets Image processing Phase detection Optimization methods Testing Image enhancement Computer vision

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Performance study of a MLS/DBMS implemented as a kernelized architecture

Performance study of a MLS/DBMS implemented as a kernelized ...

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

作者： M. Garuba E. Appiah L. Burge Department of Systems and Computer Science Howard University College of Medicine Washington D.C. DC USA

Although users of multi-level secure database management system (MLS/DBMS) continue to rely on existing systems to satisfy their multi-level security needs, these systems no longer enjoy direct commercial-off-the-shelf (COTS) support. This calls for a renewed approach to developing MLS/DBMS systems. We advocate fragmentation as a good basis for implementing multi-level security, and to this end we implemented a prototype MLS/DBMS that utilizes the inherent advantages of the distribution scheme in distributed databases for controlling access to single-level fragments. Experiments were instrumented to determine the relative performance of the tuple, attribute, and element level fragmentation schemes. The experiments measured the impact of varying the number of tuples, attributes, security levels, and nodes, for a selection and join query. Overall, our study finds that the attribute level fragmentation scheme demonstrates superior performance to the tuple and element level schemes. The response times (and hence the performance) of the element level fragmentation scheme exhibited the worst performance degradation compared to the tuple and attribute level schemes.

关键词： Multilevel systems Data security Distributed databases information retrieval Database systems Prototypes Access control Computer architecture Instruments Computer science

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Summarizing inter-query learning in content-based image retrieval via incremental semantic clustering

Summarizing inter-query learning in content-based image retr...

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

作者： I. Gondra D.R. Heisterkamp Department of Computer Science Oklahoma State University Stillwater OH USA

In previous work, we developed a novel relevance feedback (RF) framework that learns one-class support vector machines (ISVM) from retrieval experience to represent the set memberships of users' high level semantics. By doing a fuzzy classification of a query into the regions of support represented by the ISVMs, past experience is merged with short-term (i.e., intra-query) learning. However, this led to the representation of long-term (i.e., inter-query) learning with a constantly growing number of ISVMs in the feature space. We present an improved version of our earlier work that uses an incremental k-means algorithm to cluster ISVMs. The main advantage of the improved approach is that it is scalable and can accelerate query processing by considering only a small number of cluster representatives, rather than the entire set of accumulated ISVMs. Experimental results against real data sets demonstrate the effectiveness of the proposed method.

关键词： Image retrieval Content based retrieval Radio frequency Feedback Support vector machines Support vector machine classification Acceleration Query processing information retrieval Nearest neighbor searches

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Arcanum: a secure and efficient key exchange protocol for the Internet

Arcanum: a secure and efficient key exchange protocol for th...

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

作者： A.S. Mian A. Masood Computer Science & Software Engineering University of Western Australia Crawley WA Australia Signals R&D Establishment MCS National University of Science and Technology Rawalpindi Pakistan

A VPN establishes a cryptographically secure network using the existing insecure infrastructure of the Internet. A number of protocols, including IPSec have been designed to establish VPNs. However, keys must be shared between the communicating peers before a VPN can be established. IKE protocol is used for exchanging keys between authenticated peers over the Internet. However, IKE is vulnerable to DoS attacks and has security holes. A number of protocols have been proposed to replace IKE but these protocols also have vulnerabilities of their own. In this paper, we present an analysis of IKE and identify its security holes and design weaknesses. We also propose a more secure and efficient key exchange protocol, Arcanum, and carry out its security analysis and comparison with existing protocols. Arcanum is more secure, robust to DoS attacks and efficient in terms of time and number of messages.

关键词： Internet Virtual private networks Cryptography Cryptographic protocols Security Public key Computer crime IP networks Telecommunication traffic Payloads

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Assessing distance learning student's performance: a natural language processing approach to analyzing class discussion messages

Assessing distance learning student's performance: a natural...

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

作者： Yi-fang Brook Wu Xin Chen Information Systems Department New Jersey Institute of Technology USA

ISBN: (纸本)0769521088

In classes supported by electronic messaging systems, students are required or encouraged to discuss the class topics and share their knowledge by posting text messages and replying to others. When the amount of messages is large, it is difficult for the instructor to read through all messages and evaluate student's performance. We apply natural language processing techniques to analyze the course messages to assess student's performance. Students are evaluated from three aspects: knowledge learned from the class, effort devoted to the class, and the activeness of their participation; three measures $keyword density (KD), message length (ML), and message count (MC), are derived from the text messages for each evaluation aspect respectively. The three measures are then combined to compute an overall performance indicator (PI) score for each student. The experiment shows that there is a high correlation between the PI scores and the actual grades; the rank order of students by the PI scores and that by the actual grades are highly correlated as well.

关键词： Computer aided instruction Natural language processing Performance analysis Humans information systems Density measurement Length measurement information analysis Particle measurements Educational technology

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