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Resolving Braess's paradox in random networks

Resolving Braess's paradox in random networks

引用

9th International Conference on Web and Internet Economics, WINE 2013

作者： Fotakis, Dimitris Kaporis, Alexis C. Lianeas, Thanasis Spirakis, Paul G. Electrical and Computer Engineering National Technical University of Athens Greece Information and Communication Systems Dept. University of the Aegean Samos Greece Department of Computer Science University of Liverpool United Kingdom Computer Technology Institute and Press - Diophantus Patras Greece

ISBN: (纸本)9783642450457

Braess's paradox states that removing a part of a network may improve the players' latency at equilibrium. In this work, we study the approximability of the best subnetwork problem for the class of random Gn,p instances proven prone to Braess's paradox by (Roughgarden and Valiant, RSA 2010) and (Chung and Young, WINE 2010). Our main contribution is a polynomial-time approximation-preserving reduction of the best subnetwork problem for such instances to the corresponding problem in a simplified network where all neighbors of s and t are directly connected by 0 latency edges. Building on this, we obtain an approximation scheme that for any constant Ε > 0 and with high probability, computes a subnetwork and an Ε-Nash flow with maximum latency at most (1 + Ε)L* + Ε, where L* is the equilibrium latency of the best subnetwork. Our approximation scheme runs in polynomial time if the random network has average degree O(poly(ln n)) and the traffic rate is O(poly(ln ln n)), and in quasipolynomial time for average degrees up to o(n) and traffic rates of O(poly(ln n)). © 2013 Springer-Verlag.

关键词： Polynomial approximation

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A privacy-preserving entropy-driven framework for tracing DoS attacks in VoIP

A privacy-preserving entropy-driven framework for tracing Do...

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2013 8th International Conference on Availability, Reliability and security, ARES 2013

作者： Tsiatsikas, Zisis Geneiatakis, Dimitris Kambourakis, Georgios Keromytis, Angelos D. Dept. of Inform. and Comm. Systems Engineering University of the Aegean Karlovassi Greece Institute of the Protection and Security Citizen Joint Research Center Ispra Italy Department of Computer Science Columbia University New York United States

ISBN: (纸本)9780769550084

network audit trails, especially those composed of application layer data, can be a valuable source of information regarding the investigation of attack incidents. Nevertheless, the analysis of log files of large volume is usually both complex (slow) and privacy-neglecting. Especially, when it comes to VoIP, the literature on how audit trails can be exploited to identify attacks remains scarce. This paper provides an entropy-driven, privacy preserving, and practical framework for detecting resource consumption attacks in VoIP ecosystems. We extensively evaluate our framework under various attack scenarios involving single and multiple assailants. The results obtained show that the proposed scheme is capable of identifying malicious traffic with a false positive alarm rate up to 3.5%. © 2013 IEEE.

关键词： Entropy

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Online Activity Traces Around a "Boston Bomber"

Online Activity Traces Around a "Boston Bomber"

引用

International Conference on Advances in Social networks Analysis and Mining

作者： Alexander Semenov Alexander Nikolaev Jari Veijalainen Dept. of Computer Science and Information Systems The University of Jyv?skyl? Jyv?skyl? Finland Dept. of Industrial and Systems Engineering The University at Buffalo SUNY Buffalo USA

ISBN: (纸本)9781479914975

This paper describes traces of user activity around a alleged online social network profile of a Boston Marathon bombing suspect, after the tragedy occurred. The analyzed data, collected with the help of an automatic social media monitoring software, includes the perpetrator's page saved at the time the bombing suspects' names were made public, and the subsequently appearing comments left on that page by other users. The analyses suggest that a timely protection of online media records of a criminal could help prevent a large-scale public spread of communication exchange pertaining to the suspects/criminals' ideas, messages, and connections.

关键词： Boston Marathon web crawling terrorist networks social media analysis

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Base station location optimisation in LTE using Genetic Algorithm

Base station location optimisation in LTE using Genetic Algo...

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International Conference on information and Communication Technology Convergence (ICTC)

作者： Aida Al-Samawi Aduwati Sali Nor Kamariah Noordin Mohamed Othman Fazirulhisyam Hashim Dept. of Computer & Communication Systems Engineering UPM Selangor Malaysia Department of Communication Technology and Network UPM Selangor Malaysia

Long Term Evolution (LTE) is a promising technology for mobile communication. This technology is based on reducing the base stations cell size, which will lead to an increment in the number of base stations. As a result, energy consumption will increase. Therefore, there is a need to optimize the LTE base stations transmission power and location to comply with the green technology. In this paper, a Genetic Algorithm (GA) optimization technique is proposed to estimate the best locations for LTE base stations, the optimum number of base stations to be used and the minimum transmission power needed for a given scenario. The proposed system is applied in Kuala Lumpur, Malaysia.

关键词： Genetic algorithms Base stations Optimization Transmitting antennas Long Term Evolution Planning

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Building a Self-Organizing Phishing Model Based upon Dynamic EMCUD

Building a Self-Organizing Phishing Model Based upon Dynamic...

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International Conference on Intelligent information Hiding and Multimedia Signal Processing (IIHMSP)

作者： Shian-Shyong Tseng Ching-Heng Ku Ai-Chin Lu Yuh-Jye Wang Guang-Gang Geng Dept. of Applied Informatics and Multimedia Asia University Taichung Taiwan Taiwan Network Information Center Taipei Taiwan Dept. of Computer Science and Information Engineering Asia University Taichung Taiwan China Internet Network Information Center Chinese Academy of Sciences Beijing China

In recent years, with the rapid growth of the Internet applications and services, phishing attacks seriously threaten the web security. Due to the versatile and dynamic nature of phishing patterns, the development and maintenance of the anti-phishing prevention system is difficult and costly. Hence, how to acquire and update the phishing knowledge and the phishing model in the anti-phishing detection system become an important issue. In this study, we use the EMCUD (Extended Embedded Meaning Capturing and Uncertainty Deciding) method to build up the phishing attack knowledge according to the identification of phishing attributes. Since users have been aware of some anti-phishing methods, phishers often evolve phishing attack to gain in the environment. The phishing attack knowledge also needs to be dynamically evolved over time. How to systematically evolve the phishing knowledge becomes a major concern of this study. Hence, we use the VODKA (Variant Objects Discovering Knowledge Acquisition) method, a dynamic EMCUD, to evolve existing phishing knowledge. These methods can facilitate the acquisition of new inference rules for the phishing attack knowledge and the observation of the variation and the trend of the phishing attack. In the experiment, 1, 762 phishing URL of the APNOW (Anti-Phishing Notification Window) phishing database of Taiwan have been partitioned into 7 representative phishing cases, and 10 phishing attributes have been obtained by the VOKDA method. Finally, we successfully evolve detection rules of phishing models and observe the trend of the phishing attack model to show the feasibility of this study.

关键词： Market research Internet Knowledge acquisition Databases Adaptation models Graphics Multimedia communication

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Power-Efficient Resource Allocation for QoS Provisioning in Underwater MIMO-OFDM Acoustic Cooperative Wireless networks

Power-Efficient Resource Allocation for QoS Provisioning in ...

引用

IEEE Global Communications Conference

作者： Ping Wang Xi Zhang Mei Song Networking and Information Systems Laboratory Dept. of Electrical and Computer Engineering Texas A&M University School of Electronic Engineering Beijing University of Posts and Telecommunications

ISBN: (纸本)9781479913510

In recent years, the multiple-input-multiple-output (MIMO), the orthogonal frequency division multiplexing (OFDM), and the relay communication techniques have significantly improved the important performance of radio wireless communication networks. Due to its wide and critical applications, we can also apply these techniques into the underwater acoustic (UWA) wireless networks. In this paper, we propose the power-efficiency resource allocation scheme for tradeoff between the power consumption and quality of service (QoS) of multimedia applications in a relay-based underwater MIMO-OFDM acoustic cooperative wireless networks. Our objective is to efficiently minimize the total power/energy consumption while supporting the QoS-guaranteed services for multimedia applications over underwater MIMO-OFDM acoustic cooperative wireless networks. To achieve these goals, we propose a joint optimization of source and relay network transmit power with the QoS-constraint for the relay-based MIMO-OFDM underwater acoustic cooperative wireless networks. We conduct the extensive simulations to validate and evaluate our proposed scheme, showing its superiority over the other existing schemes.

关键词： MIMO-OFDM UWA cooperative wireless networks Power/energy efficiency Resource allocation Quality of service Amplify and forward relaying

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A broadcast streaming method over ad hoc networks enabling high packet reachability and long battery lifetime

A broadcast streaming method over ad hoc networks enabling h...

引用

2012 9th Asia-Pacific Symposium on information and Telecommunication Technologies, APSITT 2012

作者： Utsu, Keisuke Sano, Hiroshi Nishikawa, Hiroaki Ishii, Hiroshi Dept. of Communication and Network Engineering Sch. of Information and Telecommunication Engineering Tokai University Tokyo Japan Dept. of Computer Science Graduate School of Systems and Information Engineering University of Tsukuba Ibaraki Japan

ISBN: (纸本)9784885522659

This paper considers cases where a specific number of nodes in an ad hoc network broadcast video and audio streams over the entire network. For the purpose, we have proposed Load and Battery Charge oriented Flooding (LBF), which reduces degradation in delivery quality, and energy consumption, and prevents nodes from being interrupted due to the complete discharge of their batteries. This paper describes an evaluation of the proposed method through network simulation. The simulation results indicate that the proposed method can prolong network running time without degradation of delivery quality. © 2012 IEICE Institute of Electronics Informati.

关键词： Energy utilization

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User-centric, privacy-preserving adaptation for voIP CAPTCHA challenges 6

User-centric, privacy-preserving adaptation for voIP CAPTCHA...

引用

6th International Symposium on Human Aspects of information security and Assurance, HAISA 2012

作者： Tasidou, A. Efraimidis, P.S. Soupionis, Y. Mitrou, L. Katos, V. Democritus University of Thrace Dept. of Electrical and Computer Engineering Greece Greece University of the Aegean Dept. of Information and Communication Systems Engineering Greece

ISBN: (纸本)9781841023175

The effectiveness of CAPTCHA challenges largely depends on being simultaneously easier to solve for humans and harder to solve for bots. In this work we argue that it is possible to enhance the effectiveness of audio CAPTCHA challenges by adapting the challenge to the users' characteristics. We propose a method for achieving this adaptation while protecting users' privacy. Moreover, our approach allows us to address discrimination issues that naturally arise in contemporary audio CAPTCHA challenges. Utilizing modern cryptographic techniques we design a privacy-preserving system, called PrivCAPTCHA, which offers customized CAPTCHA challenges. Copyright © 2012 HAISA.

关键词： Electronic mail filters

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A cross-layer security framework for wireless mesh networks 1

引用

2011 International Conference on Future Wireless networks and information systems, ICFWI 2011

作者： Wei, Chuyuan Li, Yongzhen Lv, Cheng Dept. of Computer Teaching and Network Information Beijing Institute of Civil Engineering and Architecture Beijing China

ISBN: (数字)9783642273230

ISBN: (纸本)9783642273223

Wireless mesh networks is a new type of broadband access network. It has very typical network architecture of hybrid mesh network architecture. As wireless mesh network with distributed network architecture, it is relatively fragile and vulnerable to attack. In this paper, we first analyze the characters of hybrid mesh network architecture. The security weaknesses of WMNs mainly reflected in the transmission channel, authentication, physical protection and routing protocols. On the basis of analysis of security defects of WMNs, we design a cross-layer security framework to improve the security of WMNs. At last, we interpret some key Technologies in this security Framework. © 2012 Springer-Verlag GmbH.

关键词： network architecture

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Application of SS-MVPN technology in mobile network

Application of SS-MVPN technology in mobile network

引用

2012 International Conference on Electrical Insulating Materials and Electrical engineering, EIMEE 2012

作者： Hang, Qiangwei Chen, Bing Hou, Qiang Key Laboratory of Information Network Security Ministry of Public Securitythe 3rd research institute of ministry of public security Shanghai China Dept. of computer engineering of Tongji University Shanghai China

ISBN: (纸本)9783037854518

More and more people are using mobile equipments to access business resources from the organization's internal network, how to ensure the data security in the data transport process of mobile intelligent terminals is becoming an urgent need to address issues. This paper proposes a new solution of mobile VPN which using the SSL to protect the data flow and SOCKS5 proxy technology to redirect flow, and gives the analysis of its performance improvement principles. © (2012) Trans Tech Publications, Switzerland.

关键词： Wireless networks

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