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SUDOKU: Secure and usable deployment of keys on wireless sensors

SUDOKU: Secure and usable deployment of keys on wireless sen...

引用

IEEE Workshop on Secure Network Protocols (NPSec)

作者： Matthias Wilhelm Ivan Martinovic Ersin Uzun Jens B. Schmitt Disco / Distributed Computer Systems Lab TU Kaiserslautern Germany Computer Science Department University of California Irvine USA

Initial deployment of secrets plays a crucial role in any security design, but especially in hardware constrained wireless sensor networks. Many key management schemes assume either manually pre-installed shared secrets or keys authenticated with the aid of out-of-band channels. While manually installing secret keys affects the practicability of the key deployment, out-of-band channels require additional interfaces of already hardware-limited wireless sensor nodes. In this work, we present a key deployment protocol that uses pair-wise ephemeral keys generated from physical layer information which subsequently enables an authenticated exchange of public keys. Hence, this work presents an elegant solution to the key deployment problem without requiring more capabilities than already available on common low-cost devices. To justify the feasibility of this solution, we implement and experimentally evaluate the proposed key deployment protocol using commodity wireless sensor motes.

关键词： Sensors Protocols Wireless sensor networks Wireless communication Communication system security Base stations Cryptography

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Situational method engineering applied for the enactment of development processes - An agent based approach

Situational method engineering applied for the enactment of ...

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作者： Seemueller, Holger Voos, Holger Honke, Benjamin Bauer, Bernhard Mobile Robotics and Mechatronics Lab. University of Applied Sciences Ravensburg-Weingarten D-88241 Weingarten Germany Programming Distributed Systems Lab. Institute of Computer Science University of Augsburg D-86135 Augsburg Germany

ISBN: (纸本)9789898425065

Interdisciplinary product development is faced with the collaboration of diverse roles and a multitude of interrelated artifacts. Traditional and sequential process models cannot deal with the long-lasting and dynamic behavior of the development processes of today. Moreover, development processes have to be tailored to the needs of the projects, which are usually distributed today. Thus, keeping these projects on track from a methodology point of view is difficult. In order to deal with these challenges, this paper will present a novel method engineering and enactment approach. It combines the ideas of workflow technologies and product line engineering for method engineering as well as agent technology for the development process enactment.

关键词： Multi agent systems

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+Spaces: Intelligent virtual spaces for eGovernment

+Spaces: Intelligent virtual spaces for eGovernment

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International Conference on Intelligent Environments

作者： Tserpes, Konstantinos Jacovi, Michal Gardner, Michael Triantafillou, Anna Cohen, Benjamin Distributed Knowledge and Media Systems Lab. National Technical University of Athens Athens Greece IBM Research Lab. - Haifa Haifa Israel School of Computer Science and Electronic Engineering University of Essex Colchester United Kingdom Athens Technology Center Athens Greece

ISBN: (纸本)9780769541495

Intelligent Environments most commonly take a physical form such as homes, offices, hotels, restaurants, shops, that are equipped with advanced networked computer based systems, which enable better or new lifestyles for people. However, Intelligent Environments can also take the form of virtual online spaces such as SecondLife, which can both mimic the real world and provide functionalities which could not be provided in reality, such as advanced simulations and movement. There is the growing trend for people to spend more time in such virtual environments and, to these ends, this work in progress paper reports on a new project, +Spaces which is developing a range of virtual world tools for e-government applications, and presents some of the concepts and technical challenges involved in creating these intelligent virtual spaces for e-government. © 2010 IEEE.

关键词： Virtual reality

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+Spaces: Intelligent Virtual Spaces for eGovernment

+Spaces: Intelligent Virtual Spaces for eGovernment

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International Conference on Intelligent Environments (IE)

作者： Konstantinos Tserpes Michal Jacovi Michael Gardner Anna Triantafillou Benjamin Cohen Distributed Knowledge and Media Systems Lab National and Technical University of Athens Athens Greece School of Computer Science and Electronic Engineering University of Essex Colchester UK IBM Research Laboratory Haifa Israel Athens Technology Center Athens Greece

关键词： Social network services Biological system modeling Government Avatars Space technology Middleware Data models

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Node deployment in large wireless sensor networks: Coverage, energy consumption, and worst-case delay 09

Node deployment in large wireless sensor networks: Coverage,...

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Asian Internet Engineeering Conference, AINTEC 2009

作者： Poe, Wint Yi Schmitt, Jens B. Disco / Distributed Computer Systems Lab. University of Kaiserslautern Germany

ISBN: (纸本)9781605586144

Node deployment is a fundamental issue to be solved in Wireless Sensor Networks (WSNs). A proper node deployment scheme can reduce the complexity of problems in WSNs as, for example, routing, data fusion, communication, etc. Furthermore, it can extend the lifetime of WSNs by minimizing energy consumption. In this paper, we investigate random and deterministic node deployments for large-scale WSNs under the following performance metrics: coverage, energy consumption, and message transfer delay. We consider three competitors: a uniform random, a square grid, and a pattern-based Tri-Hexagon Tiling (THT) node deployment. A simple energy model is formulated to study energy consumption for each deployment strategy. Using basic geometry we propose a novel strategy for calculating the relative frequency of exactly k-covered points, which uses k-coverage maps, for both a square grid and THT. To model and consequently control the worst-case delay of a given WSN we build upon the so-called sensor network calculus (a recent methodology introduced in [7]). Finally, we analyze tradeoffs between these performance metrics for each deployment strategy to show which strategy is preferable under what factors, e.g., the number of nodes. Copyright 2009 ACM.

关键词： Energy utilization

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Sink placement without location information in large-scale wireless sensor networks 09

Sink placement without location information in large-scale w...

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Asian Internet Engineeering Conference, AINTEC 2009

作者： Poe, Wint Yi Schmitt, Jens B. Disco / Distributed Computer Systems Lab. University of Kaiserslautern Germany

ISBN: (纸本)9781605586144

Wireless Sensor Networks (WSN) comprise a large number of sensor nodes that possess scarce energy supplies. To minimize energy consumption and to consequently extend the lifetime of WSNs, we propose a local search technique for sink placement in WSNs. In addition, a proper sink placement plays a vital role in performance-sensitive WSN applications. Since it is not feasible for a sink to use global information, especially for large-scale WSNs, we introduce a self-organized sink placement (SOSP) strategy that combines the advantages of our previous works [7] and [8]. Besides, this paper is a substantial extension of [9]. The goal of this research is to provide a better sink placement strategy with a lower communication overhead. Avoiding the costly design of using the nodes' location information, each sink sets up its own group by communicating to its n-hop distance neighbors. While keeping the locally optimal placement, SOSP exhibits a better solution quality with respect to communication overhead and computational effort than previous solutions. To analyze performance issues, especially the worst-case delay of a given WSN, we use a methodology called sensor network calculus [10]. Copyright 2009 ACM.

关键词： Sensor nodes

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Security by wireless: Why play fairer than the attacker 09

Security by wireless: Why play fairer than the attacker

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Asian Internet Engineeering Conference, AINTEC 2009

作者： Martinovic, Ivan Disco / Distributed Computer Systems Lab. Computer Science Department University of Kaiserslautern 67653 Kaiserslautern Germany

ISBN: (纸本)9781605586144

Security in wireless networks is a notorious problem, suffering from the following dilemma: On the one hand, wireless medium access puts the attacker into a much better position, on the other hand wireless devices most often have resource deficiencies (processing, memory, energy) which make conventional attack countermeasures based on cryptographic solutions impractical. Though, there have been many approaches towards lightweight security for wireless networks, this dilemma always persists, at least for the low-cost sector, say, for example, sensor networks or RFIDs. So far the overwhelming majority of wireless security approaches followed a conventional security paradigm which abstracts the physical communication as a logical channel. We depart from this paradigm, and try to leverage from the physical characteristics of wireless communications as much as possible, thus bringing us again in equality of arms with the attacker. This we coined the security by wireless principle. In the talk, several incarnations of the security by wireless principle are presented. These are taken from WLAN as well as wireless sensor network scenarios and show for different security goals that security by wireless designs can lead to interesting security solutions. Copyright 2009 ACM.

关键词： Wireless sensor networks

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Arogyashree: A distributed file system for large scale internet-based telemedicine

Arogyashree: A distributed file system for large scale inter...

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1st International Workshop on Mobilizing Health Information to Support Healthcare-Related Knowledge Work, MobiHealthInf 2009 In Conjunction with BIOSTEC 2009

作者： Ponnavaikko, Kovendhan Janakiram, D. Distributed and Object Systems Lab Department of Computer Science and Engineering Indian Institute of Technology Madras Chennai India

ISBN: (纸本)9789898111784

Today, a typical telemedicine system involves a small set of hospitals providing remote healthcare services to a small section of the society using nodal centers, mobile health units, etc. However, the benefits of a telemedicine system increase with scale. One of the key requirements of such a large scale system is to allow large numbers of patient medical records, in the form of electronic files, to be efficiently stored and accessed from widely distributed locations. In this paper, we address the need for a distributed file system to manage patient data in large scale telemedicine systems. We use the resources of unreliable Internet edge nodes distributed among hospitals, labs, etc., to provide reliable file system services to patients and doctors. Besides building an Internet-based system that scales with the number of nodes and files, we also attempt to optimize record access times for doctors to provide timely responses.

关键词： Hospitals

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SemanticQA: Web-based ontology-driven question answering 09

SemanticQA: Web-based ontology-driven question answering

引用

24th Annual ACM Symposium on Applied Computing, SAC 2009

作者： Tartir, Samir McKnight, Bobby Arpinar, I. Budak Large-Scale Distributed Information Systems Lab. Department of Computer Science University of Georgia Athens GA 30602-7404 United States

ISBN: (纸本)9781605581668

The ability to ask specific question to the internet using natural language and receiving answers instead of documents is highly desired. Recent advancements in semantic web technologies make it possible to support such capability with more accuracy compared to existing non-semantic techniques. Using our expertise in ontology building and semantic search and discovery we designed an ontology-driven question answering system that extracts answers from web documents. This system processes natural language queries using a background ontology and finds possible answer(s) to the question from web documents. Copyright 2009 ACM.

关键词： Ontology

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Self-organized sink placement in large-scale wireless sensor networks

Self-organized sink placement in large-scale wireless sensor...

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International Symposium on Modeling, Analysis and Simulation of computer and Telecommunication systems (MASCOTS)

作者： Wint Yi Poe Jens B. Schmitt Distributed Computer Systems Lab (DISCO) Technical University of Kaiserslautern Kaiserslautern Germany

ISBN: (纸本)9781424449279

The deficient energy supplies of wireless sensor networks (WSNs) drives network designers to optimize energy consumption in various ways. Not only with regard to the energy issue but also with respect to system performance, we design a local search technique for sink placement in WSNs that tries to minimize the maximum worst-case delay and extend the lifetime of a WSN, simultaneously. Since it is not feasible for a sink to use global information, which especially applies to large-scale WSNs, we introduce a self-organized sink placement (SOSP) strategy that combines the advantages of our previous works. The goal of this research is to provide a better sink placement strategy with a lower communication overhead. Avoiding the costly design of using nodes' location information, each sink sets up its own group by communicating to its n-hop distance neighbors. While keeping the locally optimal placement, SOSP exhibits a quality of the solutions with respect to communication overhead as well as computational effort that are better than previous solutions. To model and consequently control the worst-case delay of a given WSN we build upon the so-called sensor network calculus (a recent methodology first introduced).

关键词： Large-scale systems Wireless sensor networks Calculus Delay Design optimization Energy consumption System performance Spread spectrum communication Integer linear programming Routing

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