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Applications of the Montgomery exponent

Applications of the Montgomery exponent

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

作者： S. Gueron O. Zuk Department of Mathematics University of Haifa Israel Department of Physics of Complex Systems Weizmann Institute of Science Israel

We define here the Montgomery exponent of order s, modulo the odd integer N, by MEXP = MEXP(A,X,N,s) = A/sup X/2/sup -s(X-1)/ (mod N), and illustrate some properties and usage of this operator. We show how A/sup X/ (mod N) can be obtained from MEXP(A, X, N, s) by one Montgomery multiplication. This suggests a new modular exponentiation algorithm that uses one Montgomery multiplication less than the number required with the standard method. This improves the performance, although the improvement is significant only when the exponent X is short (e.g., modular squaring or RSA verification). However, and even more important, this achieves code size reduction, which is appreciated when the exponentiation algorithm is written in a low-level language and stored in (expensive) ROM. We also illustrate the potential advantage in performance and code size when known cryptographic applications are modified in a way that MEXP replaces the standard modular exponentiation.

关键词： Public key cryptography Mathematics Physics Read only memory Code standards Arithmetic Hardware Costs Public key information technology

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An adaptive scalable multiuser-OFDM system for multimedia transmission over fading channels

An adaptive scalable multiuser-OFDM system for multimedia tr...

引用

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

作者： A.M.M. Nadhim Jianhua He Jiangtao Xi Zongkai Yang Electronics and Information Engineering Department Huazhong University of Science and Technology Wuhan China School of Electrical Computer and Telecommunications Engineering University of Wollongong Wollongong Australia

In this paper, an adaptive scalable multiuser-OFDM system was proposed for multimedia transmission over fading channels. The proposed adaptive algorithm can adapt according to the channel status information of each user's channel status. This algorithm dynamically changes according to the user's channel changes; this can keep fixed QoS at the physical layer. Another predefined QoS for different sessions and services to be provided for different users. This QoS can be guaranteed by multimedia scalability. Scalability can adapt to the service requirements, in terms of transmission data rate and bandwidth. As a result, a robust multimedia transmission scheme is achieved by providing fix QoS for the end users in multiuser environment, by fixing QoS in the physical layer by the bit and power adaptation technique and also in service layer by scalability techniques. Furthermore, space diversity techniques are used to decrease the effect of frequency selective multipath effects in broadband wireless channels.

关键词： Adaptive systems Multimedia systems Fading Scalability Physical layer Adaptive algorithm Heuristic algorithms Bandwidth Robustness Frequency diversity

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Practical evaluation of a radial soft hash algorithm

Practical evaluation of a radial soft hash algorithm

引用

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

作者： F.-X. Standaert E. Lefebvre G. Rouvroy B. Macq J.-J. Quisquater J.-D. Legat Crypto Group Univ. Catholique de Louvain Belgium Laboratoire de Télécommunications et Télédétection Université Catholique de Louvain Belgium Laboratoire de Microélectronique Université Catholique de Louvain Belgium

This paper presents a practical evaluation of a radial soft hash algorithm, an image hashing technique used for image and visual content authentication. First we evaluate its collision resistance and susceptibility to geometrical deformations and image processing attacks. Second we investigate its actual efficiency on different platforms. Although software implementations allow managing sizes and throughput for most applications, they suffer from some troubles for real time applications such as video and for images in high definition. For these more constrained contexts, we propose hardware implementations. In practice, throughput up to 2/sup 18/ (resp. 2/sup 26/) pixels/sec are managed in a single SW (resp. HW) implementation.

关键词： Cryptography Robustness Authentication Throughput Application software Content management Watermarking Digital signatures Image coding Videoconference

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Media access mechanisms for integrated services in wireless networks

Media access mechanisms for integrated services in wireless ...

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

作者： Sheng-Tzong Cheng Ming-Hung Tao Mingzoo Wu Department of Computer Science and Information Engineering National Cheng Kung University Tainan County Taiwan

ISBN: (纸本)0769523153

In the paper, we propose a media access framework for supporting integrated service including the real-time service, the controlled load service, and the best effort service in wireless networks. Three medium access mechanisms, the "Multi-classes fair scheduling", the "Single-class fair scheduling + DCF", and the "Single-class fair scheduling + DCF with threshold for controlled load service" are proposed in the paper to manage the traffic within a piconet. Moreover, a measurement based admission control algorithm is proposed to guarantee the QoS requirements for the requests. We compare the performance of the proposed access mechanisms by conducting simulations. The simulation results show that the "Multi-classes fair scheduling " mechanism is the best choice for the networks occupied by the real-time service; the "Single-class fair scheduling + DCF with threshold for controlled service" mechanism is the best for controlled service in general case.

关键词： Intserv networks Intelligent networks Wireless networks Communication system control Peer to peer computing Admission control Telecommunication traffic Communication system traffic control Personal area networks Access protocols

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Design theoretic approach to replicated declustering

Design theoretic approach to replicated declustering

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

作者： A.S. Tosun Department of Computer Science University of Technology San Antonio TX USA

Declustering techniques reduce query response times through parallel I/O by distributing data among multiple devices. Most of the research on declustering is targeted at spatial range queries and investigates schemes with low additive error. Recently, declustering using replication is proposed to reduce the additive overhead. Replication significantly reduces retrieval cost of arbitrary queries. In this paper, we propose a disk allocation and retrieval mechanism for arbitrary queries based on design theory. Using proposed c-copy replicated declustering scheme, (c - 1)k/sup 2/ + ck buckets can be retrieved using at most k disk accesses. Retrieval algorithm is very efficient and is asymptotically optimal with /spl Theta/(|Q|) complexity for a query Q. In addition to the deterministic worst-case bound and efficient retrieval, proposed algorithm handles nonuniform data, high dimensions, supports incremental declustering and has good fault-tolerance property.

关键词： information retrieval Costs Fault tolerance Spatial databases Computer science Delay Computer errors Visual databases information systems Data visualization

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Dynamic learning of automata from the call stack log for anomaly detection

Dynamic learning of automata from the call stack log for ano...

引用

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

作者： Zhen Liu S.M. Bridges Department of Computer Science and Engineering Mississippi State University USA

Anomaly detection based on monitoring of sequences of system calls has proved to be an effective approach for detection of previously unknown attacks on programs. This paper describes a new model for profiling normal program behavior that can be used to detect intrusions that change application execution flow. The model (hybrid push down automaton, HPDA) incorporates call stack information and can be learned by dynamic analysis of training data captured from the call stack log. The learning algorithm uses call stack information maintained by the program to build a finite state automaton. When compared to other approaches including VtPath which also uses call stack information, the HPDA model produces a more compact and general representation of control flow, handles recursion naturally, can be learned with less training data, and has a lower false positive rate when used for anomaly detection. In addition, dynamic learning can also be used to supplement a model acquired from static analysis.

关键词： Learning automata Training data Power system modeling Heuristic algorithms Bridges Computer science Computerized monitoring Data analysis information analysis Change detection algorithms

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Simulation of mobility and routing in ad hoc networks using ant colony algorithms

Simulation of mobility and routing in ad hoc networks using ...

引用

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

作者： T.H. Ahmed Institute for Computer Science and Business Information Systems University of Duisburg-Essen Germany

Mobile ad-hoc networks (MANET's) have recently attracted a lot of attention in the research community as well as the industry. This technology has become increasingly important in communication and networking. Routing is one of the most important and difficult aspects in ad hoc network since ad hoc network topology frequently changes. Conventional routing algorithms are difficult to be applied to a dynamic network topology, therefore modeling and design an efficient routing protocol in such dynamic networks is an important issue. One of the meta-heuristic algorithms which is inspired by the behavior of real ants is called ant colony optimization (ACO) algorithm, it can definitely be used as a tool to tackle the mercurial scenarios present in this dynamic environment. In this paper, the author has designed a model, which combines ant colony behavior and queuing network analysis to evaluate end-to-end packet delay in MANET.

关键词： Routing Intelligent networks Ad hoc networks Mobile ad hoc networks Network topology Mobile communication Ant colony optimization Queueing analysis Personal digital assistants Algorithm design and analysis

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High throughput Web services for life sciences

High throughput Web services for life sciences

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

作者： M. Altunay D. Colonnese C. Warade North Carolina State University Raleigh NC USA IBM Portals Hartford CT USA IBM Health Care and Life Science Cambridge MA USA

This paper describes a collaborative project between IBM and the North Carolina BioGrid: building, deploying, and using high-throughput Web services for bioinformatics applications. Bioinformatics applications can highly benefit from grid computing power, but the challenges of exposing these applications to the grid often cause reluctance. Typical bioinformatics applications are "quick-and-dirty" Perl scripts, which usually run at small homegrown laboratory clusters. Our work intends to fill the gap between grid power and the bioinformatics world by utilizing Web services and by extending the Open-Bioinformatics Foundation's software package BioPerl. Our extensions to BioPerl libraries allow bioinformatics applications to be exposed to Web services seamlessly. Our development tool WSDL2Perl integrates these applications with the vast computational power of the NC BioGrid. We present a case study in building Web services for bioinformatics applications, namely BLAST (a well-known standard homology search application), and a process for deploying grid-enabled Web services to the NC BioGrid.

关键词： Throughput Web services Bioinformatics Application software Grid computing Software packages Software libraries Pipelines Computer applications XML

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A time-series biclustering algorithm for revealing co-regulated genes

A time-series biclustering algorithm for revealing co-regula...

引用

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

作者： Ya Zhang Hongyuan Zha Chao-Hisen Chu School of Information Sciences and Technology Pennsylvania State University USA Department of Computer Science and Engineering Pennsylvania State University USA

ISBN: (纸本)0769523153

Although existing bicluster algorithms claimed to be able to discover co-regulated genes under a subset of given experiment conditions, they ignore the inherent sequential relationship between crucial time points and thus are not applicable to analyze time-series gene expression data. A simple and effective deletion-based algorithm, using the mean squared residue score as a measure, was developed to bicluster time-series gene expression data. While enforcing a threshold value for the score, the algorithm alternately eliminates genes and time points according to their correlation to the bicluster. To ensure the time locality, only the starting and ending points in the time interval are eligible for deletion. As a result, the number of genes and the length of time interval are simultaneously maximized. Our experimental results shown that the proposed method is capable of identifying co-regulated genes characterized by partial time-course data that previous methods failed to discover.

关键词： Gene expression Regulators Fungi Hidden Markov models Time series analysis Chaos Computer science Data engineering information analysis Algorithm design and analysis

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On the masking countermeasure and higher-order power analysis attacks

On the masking countermeasure and higher-order power analysi...

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

作者： F.-X. Standaert E. Peeters J.-J. Quisquater Crypto Group University College London Louvain-la-Neuve Belgium

Masking is a general method used to thwart differential power analysis, in which all the intermediate data inside an implementation are XORed with random Boolean values. As a consequence, the power consumption of the running implementation becomes unpredictable, making first-order power analysis attacks unpractical. Several recent works have shown that such protected designs are still susceptible to higher-order power analysis attacks. In this paper, we propose an extension of the previously introduced higher-order techniques, based on a more general power consumption model, and evaluate its actual feasibility. In particular, we discuss the number of power traces required to mount successful attacks. We also illustrate how this number is affected by parallel computations, making certain implementation contexts (e.g. smart cards, 8-bit processors) more susceptible than others (e.g. FPGAs, ASICs).

关键词： Cryptography Protection Security Energy consumption Smart cards Field programmable gate arrays Concurrent computing Circuits Hardware Algorithm design and analysis

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