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检索条件"任意字段=International Conference on Information Technology: Coding Computing, ITCC 2004"

共 1041 条记录，以下是411-420 订阅

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Geoblock: a LVQ-based framework for geographic image retrieval

Geoblock: a LVQ-based framework for geographic image retriev...

引用

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

作者： L. Zhu Department of Information Technology Armstrong Atlantic State University Savannah USA

Novel approaches are needed to support content-based retrieval on geographic image databases. Motivated by the success in the text-based information retrieval, where the indexing and retrieval is based on keywords, we present the framework of geoblock-based image retrieval, where the retrieval is conducted based on the concept of visual keyword: "geoblock". We introduce a learning vector quantization (LVQ) based approach to construct the dictionary of semantic-oriented geoblocks. Based on the frequency and correlation of these geoblocks in the images, comprehensive geographic image features are extracted to facilitate image retrieval. The experimental results demonstrate the effectiveness of this approach.

关键词： Image retrieval information retrieval Image segmentation Content based retrieval Indexing Vector quantization Space exploration information technology Dictionaries Pixel

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A novel DCT-based approach for secure color image watermarking

A novel DCT-based approach for secure color image watermarki...

引用

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

作者： N. Ahmidi R. Safabakhsh Amirkabir University of Technology슠 Iran

We focus on visually meaningful color image watermarks, we construct a new digital watermarking scheme based on the discrete cosine transformation. The proposed method uses the sensitivity of human eyes to adoptively embed a watermark in a color image. In addition, to prevent tampering or unauthorized access, a new watermark permutation function is proposed, which causes a structural noise over the extracted watermark. Also, we have proposed a procedure to eliminate this noise to decrease false positives and false negatives in the extracted watermark. The experimental results show that embedding the color watermark adapted to the original image produces the most imperceptible and the most robust watermarked image under geometric and volumetric attacks.

关键词： Color Watermarking Discrete cosine transforms Frequency Image coding Streaming media Robustness Security information technology Transform coding

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A system for ensuring data integrity in grid environments

A system for ensuring data integrity in grid environments

引用

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

作者： A. Gilbert A. Abraham M. Paprzycki Department of Computer Science Oklahoma State University USA

Data integrity has to become one of the central concerns of large-scale distributed computing systems such as the grid, whose primary products are the results of computation. In order to maintain the integrity of this data, the system must be resilient to diverse attacks and tampering. The system should also encourage positive influences on its integrity in addition to discouraging or eliminating negative ones. In this paper we develop a model of trust for grid participants based on the use of reputation systems and associated feedback mechanisms.

关键词： Distributed computing Grid computing Large-scale systems Data security Communication system security Computer science Application software Protection Feedback Computer security

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Architectural design features of a programmable high throughput AES coprocessor

Architectural design features of a programmable high through...

引用

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

作者： A. Hodjat P. Schaumont I. Verbauwhede Electrical Engineering Department University of California Los Angeles USA

Programmable, high throughput domain specific crypto processors are required for different networking applications. We present the architectural design features that lead to a multiple Gbits/s rate AES coprocessor, which is programmable with domain specific instructions for Gbit throughput IPSec and other applications. Our design is a loosely coupled, independently working crypto-coprocessor that runs AES in ECB, CBC-MAC, Counter, and CCM modes of operation at a maximum throughput of 3.43 Gbits/s in a 0.18 /spl mu/m CMOS technology without any penalty in throughput for any of the above modes.

关键词： Throughput Coprocessors Cryptography Counting circuits CMOS technology Security Clocks Assembly Virtual private networks Ethernet networks

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How to make e-cash with non-repudiation and anonymity

How to make e-cash with non-repudiation and anonymity

引用

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

作者： R. Song L. Korba Institute for Information Technology National Research Council Canada Ottawa ONT Canada

Current e-cash systems enable anonymity services to protect users' privacy, but most of them do not provide the nonrepudiation service such that many problems exist in the systems like denying, losing, misusing, stealing, and double-spending, etc. We propose an e-cash system in which a one-time public key is embedded in the partial blind signature to provide the nonrepudiation service against the above attacks. We also demonstrates that the combination of the partial blind digital signature and anonymous digital signature makes the e-cash systems more robust and fair than before.

关键词： Privacy Protocols Protection Public key Digital signatures information technology Data security Terminology Councils Robustness

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A hybrid classifier approach for Web retrieved documents classification

A hybrid classifier approach for Web retrieved documents cla...

引用

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

作者： R.S. Bot Yi-fang Brook Wu Xin Chen Quanzhi Li Information Systems Department New Jersey Institute of Technology USA

The paper presents a hybrid technique for the classification of Web returned hits into concept hierarchies. The technique involves a combination of manual and automatic classifiers. At first, all Web returned documents are assigned to human defined categories using manual classifiers, and then automatic classifiers are used to generate a concept hierarchy for each of these categories. The results of the evaluation reveal the following: (a) for polysemous queries, our system is able to generate meaningful categories corresponding to (but not limited to), the different semantic facets of the queries; (b) as expected, for non-polysemous queries the system generates fewer categories; (c) the hierarchy precision of the concept hierarchies generated for polysemous queries is found to be significantly better when compared to the one obtained using a baseline system.

关键词： Manuals Humans information retrieval information systems Paper technology Internet information filtering Scattering information technology

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A parallel architecture for computing scalar multiplication on Hessian elliptic curves

A parallel architecture for computing scalar multiplication ...

引用

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

作者： N.A. Saqib F. Rodriguez-Henriquez A. Diaz-Perez Computer Science Section Electrical Engineering Department Centro de Investigación y de Estudios Avanazados del Instituto Politécnico Nacional Mexicali Mexico

A parallel architecture for the computation of Hessian elliptic curve scalar multiplication over binary fields is presented. The architecture was designed as general as possible trying to make no assumptions about the specific hardware platform to be used by the designers. The idea of using parallel strategies was considered in every design stage and implemented as much as hardware resources allowed us to do it so. The design results reported allow us to compute GF(2/sup 191/) elliptic curve scalar multiplication operations in about 114.7/spl mu/ Secs.

关键词： Parallel architectures Concurrent computing Elliptic curves Computer architecture Hardware Elliptic curve cryptography High performance computing Computer science Very large scale integration Timing

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Identity-based threshold signature scheme from the bilinear pairings (extended abstract)

Identity-based threshold signature scheme from the bilinear ...

引用

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

作者： Joonsang Baek Yuliang Zheng Monash University Australia UNC-Charlotte USA

ISBN: (纸本)0769521088

The focus of this paper is to formalize the concept of identity-based threshold signature and give the first provably secure scheme based on the bilinear pairings. An important feature of our scheme is that a private key associated with an identity rather than a master key of the public key generator is shared among signature generation servers, which is more desirable in practice. Another interesting aspect of our results is that the security of one of the verifiable secret sharing schemes used to construct the identity-based threshold signature scheme is relative to a slightly modified version of the generalized Tate inversion problem recently proposed by Joux.

关键词： Identity-based encryption Public key Cryptography information security Power generation Concrete information technology Cryptographic protocols

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Applying continuous action reinforcement learning automata(CARLA) to global training of hidden Markov models

Applying continuous action reinforcement learning automata(C...

引用

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

作者： J. Kabudian M.R. Meybodi M.M. Homayounpour Department of Computer Engineering and Information Technology Amirkabir University of Technology슠 Tehran Iran

In this research, we have employed global search and global optimization techniques based on simulated annealing (SA) and continuous action reinforcement learning automata (CARLA) for global training of hidden Markov models. The main goal is comparing CARLA method to other continuous global optimization methods like SA. Experimental results show that the CARLA outperforms SA. This is due to the fact that CARLA is a continuous global optimization method with memory and SA is a memoryless one.

关键词： Learning automata Hidden Markov models Covariance matrix Optimization methods Search methods Multidimensional systems information technology Computational modeling Computer simulation Simulated annealing

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Experiments on a secure compression algorithm

Experiments on a secure compression algorithm

引用

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

作者： E. Celikel M.E. Dalkilic Ege University International Computer Institute Turkey

A compression tool can provide security to some degree, if the algorithm itself is kept secret. Whenever the algorithm is known, as is the case for conventional compression, we cannot expect secrecy out of the tool. If security is needed as well, compression can be combined with encryption. To employ a system that would afford security while compressing, a novel technique (named as secure compression -SeCom) has been designed and implemented. We present the experimental results obtained by applying this scheme on texts from English and Turkish corpora. The results are promising in terms of compression quality and throughput, measured in bpc and MB/min, respectively.

关键词： Compression algorithms Cryptography Encoding Decoding Performance evaluation Computer security Throughput Random number generation Arithmetic information technology

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