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International Conference on Multimedia Information Networking and Security

作者： Yuan, Feng Hu, Yupu Wang, Yan Key Laboratory of Computer Networks and Information Security Xidian University Xi'an China School of Science Xi'an University of Architecture and Technology Xi'an China

ISBN: (纸本)9780769542584

This paper investigates the security of the projected C*- cryptographic scheme, and presents a method to attack the scheme. The basic idea of the attack is to utilize the affine part of the private keys and the weakness caused by the structure of the private key to find a number of linear equations. The attack can recover the private keys efficiently when the parameters are q ≤ 23, n ≤ 10 and s=1. © 2010 IEEE.

关键词： Public key cryptography

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Implementation of data survival in unattended wireless sensor networks using cryptography

Implementation of data survival in unattended wireless senso...

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35th Annual IEEE Conference on Local computer networks, LCN 2010

作者： Mateus, A. S. Santos Margi, Cíntia Borges Simplício Jr., Marcos A. Geovandro, C. C. F. Pereira De Oliveira, Bruno Trevizan Laboratory of Computer Architecture and Networks Departamento de Engenharia Da Computação e Sistemas Digitais Escola Politécnica Da Universidade de São Paulo Brazil

ISBN: (纸本)9781424483877

Security in Wireless Sensor networks (WSNs) is highly dependent on the behavior of the base station. This happens because, if the network is left unattended, sensor nodes cannot offload data to the (secure) base station in real time and, thus, until the base station becomes available, adversaries can compromise some sensor nodes and selectively destroy data. In order to prevent such attacks, providing the so-called "data survival", some strategies can be employed. In this paper, we discuss and analyze different data survival strategies using cryptography. To the best of our knowledge, we provide the first implementation of such techniques, using a real sensor platform for their evaluation. As a result, we show that the main costs for the data survival process are not as high as it could be expected, and that strategies based on private keys can be used even if one considers the highly resource constrained nature of sensors. © 2010 IEEE.

关键词： Base stations

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Known User Continuous Authentication System

Known User Continuous Authentication System

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Consumer Communications and Networking Conference, CCNC IEEE

作者： Ines Brosso Fernando Ferreira Graca Bressan Wilson V. Ruggiero College of Computation and Informatics Mackenzie Presbyterian University Sao Paulo Brazil Laboratory of Computer Architecture and Networks Polytechnic School of São Paulo University Brazil Laboratory of Computer Architecture and Networks Department of Computer and Digital System Engineering Polytechnic of São Paulo University Brazil

This work presents KUCAS (Known User Continuous Authentication System), a work-in-progress security system, that has a continuous authentication mechanism of users in software application. The KUCAS system makes use of environmental context information, users behavior analysis, the behavior theories of Skinner and the Mathematical Confidence of Dempster-Shafer Evidences Theory, that establishes trust levels to authenticate the user by his behavior analysis, during an application software, in a specific domain of the computer networks, in a period of time. The dynamics of enclosed management in this system compares the current behavior with the user's previous behaviors description and with the trust restrictions. In case of indications of changes in the user's behavior, the system provides the behavior analysis of the user using database restrictions information. If there are uncertainties and divergences, mechanisms of security and alert signals are triggered.

关键词： Authentication Application software Information security Data security Information analysis computer security Humans Communication system software Databases Context-aware services

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Security Analysis of Projected C*- Scheme

Security Analysis of Projected C*- Scheme

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International Conference on Multimedia Information Networking and Security (MINES)

作者： Feng Yuan Yupu Hu Yan Wang Key Laboratory of Computer Networks and Information Security Xidian University Xi'an China School of Science Xi'an University of Architecture and Technology Xi'an China

This paper investigates the security of the projected C* - cryptographic scheme, and presents a method to attack the scheme. The basic idea of the attack is to utilize the affine part of the private keys and the weakness caused by the structure of the private key to find a number of linear equations. The attack can recover the private keys efficiently when the parameters are q ≤ 2 3 , n≤10 and s=1.

关键词： Mathematical model Polynomials Public key cryptography Symmetric matrices

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Improving QoS of web service composition by dynamic configuration

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Information Technology Journal 2010年第3期9卷 422-429页

作者： Yang, Huaizhou Li, Zengzhi Institute of Computer Architecture and Networks Xi'an Jiaotong University Xi'an 710049 China State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China

In order to achieve self-adaptation to run-time environment and self-management of Web service composition, an extended hierarchical Petri net is presented to reflect the feasible configuration scheme of composite service. Being different from related works, the dynamic configuration scheme and execution process of Web service composition can be reflected together in the extended model. Furthermore, a rapid QoS calculation strategy of composite service is presented. Some important QoS calculation formulas are presented and proved. Based on the extended model and the QoS calculation strategy, a configuration with optimal QoS can be selected dynamically. The QoS of composite service is improved. The soundness and correctness of the dynamic configuration method are proved by simulation results and corresponding analysis. © 2010 Asian Network for Scientific Information.

关键词： Petri nets

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Known User Continuous Authentication System for Consumer Application Software

Known User Continuous Authentication System for Consumer App...

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Consumer Communications and Networking Conference, CCNC IEEE

作者： Ines Brosso Graca Bressan Wilson V. Ruggiero College of Computation and Informatics Mackenzie Presbyterian University Sao Paulo Brazil Laboratory of Computer Architecture and Networks Department of Computer and Digital System Engineering Polytechnic of São Paulo University Brazil

This paper presents KUCAS (Known User Continuous Authentication System), a work-in-progress security system, that has a continuous authentication mechanism of users/consumers. The KUCAS system makes use of environmental context information, users behavior analysis, the behavior theories of Skinner and the Mathematical Confidence of Dempster-Shafer Evidences Theory, that establishes trust levels to authenticate the user by his behavior analysis, during an application software, in a specific domain of the computer networks, in a period of time. The dynamics of enclosed management in this system compares the current behavior with the user's previous behaviors description and with the trust restrictions. In case of indications of changes in the user's behavior, the system provides the behavior analysis of the user using database restrictions information. If there are uncertainties and divergences, mechanisms of security and alert signals are triggered.

关键词： Authentication Application software Information security Information analysis Data security computer security Humans computer networks Peer to peer computing History

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Experimental investigation of multi-wavelength clock recovery based on a quantum-dot SOA at 40 Gb/s

Experimental investigation of multi-wavelength clock recover...

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Signal Processing in Photonic Communications, SPPCom 2010

作者： Spyropoulou, M. Bonk, R. Hillerkuss, D. Pleros, N. Vallaitis, T. Freude, W. Tomkos, I. Leuthold, J. Aristotle University of Thessaloniki Department of Informatics Computer Architecture and Communications Laboratory Thessaloniki 54142 Greece Institute of Photonics and Quantum Electronics Karlsruhe Institute of Technology Engesserstr. 5 76131 Karlsruhe Germany Athens Information Technology High speed networks and optical communications Markopoulou Av. 19002 Peania-Attica Greece

We study single and multi-wavelength clock recovery functionality based on a fabry-pérot filter followed by a quantum-dot SOA at 40 Gb/s and we demonstrate its performance for various pseudo-random binary sequenc... 详细信息

ISBN: (纸本)9781557528964

关键词： Nanocrystals

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A Continuous Authentication System Based on User Behavior Analysis

A Continuous Authentication System Based on User Behavior An...

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International Conference on Availability, Reliability and Security, ARES

作者： Ines Brosso Alessandro La Neve Graça Bressan Wilson Vicente Ruggiero College of Computation and Informatic Mackenzie Presbyterian University Sao Paulo SP Brazil Department of Electrical Engineering Centro Universitário da FEI Sao Paulo SP Brazil Laboratory of Computer Architecture and Networks Department of Computer and Digital System Engineering Polytechnic School of São Paulo University Brazil Laboratory of Computer Architecture and Networks Department of Computer and Digital System Engineering Polytechnic School of São Paulo University Brazil

ISBN: (纸本)9781424458790

This paper presents a continuous authentication system based on user behavior analysis that makes use of environmental context information, users' behavior analysis and Neuro-Fuzzy Logic. This system must be able to acquire information in context, making them into a computational environment. This information is the basis of user behavior. The System, based on the evidences of the behavior, establishes if it can trust the user or not. According to the user behavior, levels of trust are released, to access the application software. Weights are attributed in the fuzzyfication process, according to the rules that were previously established for the parameters which help to establish the evidences of behavioral trust, in its different degrees. The neuro-fuzzy logic allows that the user behavioral database be continuously updated, interacting with the fuzzyfication mechanism, so as to keep trust levels updated according to the user behavior, in a more accurate and faithful way.

关键词： Authentication Application software Information analysis Information security Logic Signal analysis Humans computer security computer networks Electronic mail

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Improved meet-in-the-middle attacks on 7-round AES-192 and 8-round AES-256

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Tongxin Xuebao/Journal on Communications 2010年第9 A期31卷 197-201页

作者： Dong, Xiao-Li Hu, Yu-Pu Chen, Jie Li, Shun-Bo Yang, Yang Key Laboratory of Computer Networks and Information Security of Ministry of Education Xidian University Xi'an 710071 China State Key Laboratory of Information Security Institute of Software Chinese Academy of Sciences Beijing 100049 China School of Science Xi'an University of Architecture and Technology Xi'an 710055 China

A new variant of 5-round distinguisher of meet-in-the-middle attack on AES was constructed by exploiting the properties of the round transform of AES. Based on the variant of distinguisher, meet-in-the-middle attacks on 7-round AES-192 and 8-round AES-256 were presented by using the time-memory tradeoff approach. It is shown that the new results are better than the cryptanalytic results presented at FSE2008 on reduced AES in terms of the time complexity and the memory complexity.

关键词： Cryptography

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Set of model reduction rules and algorithms for web services composition under orchestration pattern

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Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University 2009年第6期43卷 20-23+47页

The performance calculation of Web services composition process in large state space is time-consuming, and is difficult to fulfill the real-time performance analysis. Therefore, a process reduction algorithm is presented to accelerate the calculation of system performance. The Web services composition process is modeled using the generalized stochastic Petri net. Through auto-detecting the reductive subnet, some regular structures, such as sequence, choice, concurrent and loop structures, can be eliminated under the precondition of preserving the timing constraints. The sub processes which can be calculated independently are separated. A large scale model can thus be reduced within a certain period. Experimental results with multiform models indicate that the system response time and throughput are obtained rapidly by using the algorithm in the dynamic and adaptive composition process. The algorithm can be applied to online performance analysis of most Web services composition process.

关键词： Stochastic systems

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