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

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

引用

itcc 2005 - international conference on information technology: coding and computing

作者： Shao, Zili Xue, Chun Zhuge, Qingfeng Sha, Edwin H.-M. Xiao, Bin Department of Computer Science University of Texas at Dallas Richardson TX 75083 United States Department of Computing Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong

ISBN: (纸本)0769523153

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. © 2005 IEEE.

关键词： Security of data

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The N/R one time password system

The N/R one time password system

引用

itcc 2005 - international conference on information technology: coding and computing

作者： Goyal, Vipul Abraham, Ajith Sanyal, Sugata Han, Sang Yong OSP Global Mumbai India School of Computer Science and Engineering Chung-Ang University Korea Republic of School of Technology and Computer Science Tata Institute of Fundamental Research India

ISBN: (纸本)0769523153

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 re-initialized is also increased significantly. The system is particularly suited for mobile and constrained devices having limited computational power. © 2005 IEEE.

关键词： Security systems

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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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itcc 2005 - international conference on information technology: coding and computing

作者： Chang, Yao-Chung Chen, Jiann-Liang Tseng, Wen-Ming 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 will revolutionize 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. Web Services, Wireless Communications, Mobile Commence Applications, Mobile Internet © 2005 IEEE.

关键词： World Wide Web

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Concept-based information access

Concept-based information access

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itcc 2005 - international conference on information technology: coding and computing

作者： Ozcan, Rifat Aslandogan, Y. Alp Dept. of Computer Science and Engineering University of Texas Arlington United States

ISBN: (纸本)0769523153

Concept-based access to information promises important benefits over keyword-based access. One of these benefits is the ability to take advantage of semantic relationships among concepts in finding relevant documents. Another benefit is the elimination of irrelevant documents by identifying conceptual mismatches. Concepts are mental structures. Words and phrases are the linguistic representatives of concepts. Due to the inherent conciseness of natural language, words can represent multiple concepts and different words may represent the same or very similar concepts. Word Sense Disambiguation attempts to resolve this ambiguity using contextual information. The use of an ontology facilitates identification of related concepts and their linguistic representatives given a key concept. Latent semantic analysis, on the other hand, attempts to reveal the hidden conceptual relationships among words and phrases based on linguistic usage patterns. In this work we explore the potential of concept-based information access via these two methods. We examine under what circumstances concept-based access becomes feasible and improves user experience. © 2005 IEEE.

关键词： information management

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On the relation between dependence and diversity in multiple classifier systems

On the relation between dependence and diversity in multiple...

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itcc 2005 - international conference on information technology: coding and computing

作者： Chen, Dechang Hua, Dong Sirlantzis, Konstantinos Ma, Xiaobin Preventive Medicine and Biometrics Uniformed Services University of the Health Sciences Bethesda MD 20814 United States Department of Computer Science George Washington University 801 22nd St. NW Washington DC 20052 United States Department of Electronics University of Kent Canterbury Kent CT2 7NT United Kingdom Computer Science and Engineering University of Minnesota 200 Union Street SE Minneapolis MN 55455 United States

ISBN: (纸本)0769523153

In this paper we investigate the issues of independence and diversity among individual classifiers participating in a multiple classifier fusion scheme. First we present a formal definition of statistically independent classifiers. Then we focus on testing the independence between two classifiers. Dependence of two classifiers leads to the conclusion that every ensemble of classifiers in which they participate is not an independent scheme. Previous studies have argued that independence of the classifiers infuses diversity in the multi-classifier system, which is directly related to improved performance. Consequently, we introduce a measure for the degree of diversity as expressed by the agreement among the classifiers' outputs in such an ensemble. A number of examples drawn from diverse domains in pattern recognition are also given to illustrate the relation between classifier dependence and diversity estimation. Our results suggest the measurement of the classifiers ' decisions agreement as an informative measure of the strength of association among dependent classifiers. © 2005 IEEE.

关键词： Classification (of information)

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

Performance evaluation of secure concurrency control algorit...

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itcc 2005 - international conference on information technology: coding and computing

作者： Kaur, Navdeep Singh, Rajwinder Sarje, A.K. Misra, Manoj Department of Electronics and Computer Engineering Indian Institute of Technology Roorkee Roorkee-247667 Uttranchal India

ISBN: (纸本)0769523153

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 [15, 17, 18, 29,] 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 [11, 31] 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. © 2005 IEEE.

关键词： Database systems

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A new generalized particle approach to allot resources and jobs for grid computing

A new generalized particle approach to allot resources and j...

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

作者： Dianxun Shuai Xiang Feng Rui Gong Xing Wang Department of Computer Science and Engineering East China University of Science and Technology Shanghai China

ISBN: (纸本)0769523153

This paper presents a new generalized particle approach (GPA) to optimally allot the resources and jobs for grid computing (Shuai and Zhao, 2004). The proposed GPA transforms the allocation problem of grid resources and grid jobs into the kinematics and dynamics of massive particles in a force-field. This paper discusses the construction, dynamics and properties of the GPA and corresponding algorithm. The GPA has many advantages in terms of the parallelism, multiobjective optimization, multitype coordination, and the ability to deal with a variety of complex issues, such as the autonomy, personality, congestion, failure of distinct grid facilities. The simulations have shown the effectiveness and suitability of the proposed approach for grid computing.

关键词： Grid computing Resource management Kinematics Parallel processing Computational modeling Large-scale systems Aggregates Availability Computer science Collaboration

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A zonal JPEG

A zonal JPEG

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

作者： Cheng-Hsiung Hsieh Department of Computer Science and Information Engineering Chao Yang University of Technology Wufeng Taiwan

ISBN: (纸本)0769523153

In this paper, a simple approach is proposed to improve the performance of JPEG. In the proposed approach, the coding scheme is identical to the JPEG except only a fixed number of coefficients are coded for each image block. Consequently, it is totally compatible with the JPEG and is termed as zonal JPEG. Simulation results indicate that the proposed zonal JPEG is able to trade little PSNR with significant bit rate reduction when compared with thee JPEG.

关键词： Transform coding PSNR Image coding Bit rate Image reconstruction Computer science Chaos Digital cameras Multimedia systems Video coding

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A stemming algorithm for the Farsi language

A stemming algorithm for the Farsi language

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

作者： K. Taghva R. Beckley M. Sadeh Information Science Research Institute University of Nevada Las Vegas USA

In this paper, we report on the design and implementation of a stemmer for the Farsi language. The results of our evaluation on a small Farsi document collection shows a significant improvement in precision/recall ove... 详细信息

关键词： Natural languages Mood information retrieval Morphology information science Displays Concatenated codes information technology Helium

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Single-parameter blackjack betting systems inspired by scatter search

Single-parameter blackjack betting systems inspired by scatt...

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

作者： R. Coleman Computer Science Department Marist College USA

This paper develops a new idea, traces, which speeds up the search for candidate Blackjack betting systems by >400X. We then use traces to enable a new application of scatter search, which identifies alternative betting systems that are statistically identical to the best professional ones and exceed others in mean betting returns in a study of 21 systems.

关键词： Scattering information technology

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