12,847 research outputs found
Smart Signs: Showing the way in Smart Surroundings
This paper presents a context-aware guidance and messaging
system for large buildings and surrounding venues. Smart Signs are
a new type of electronic door- and way-sign based on wireless sensor networks.
Smart Signs present in-situ personalized guidance and messages,
are ubiquitous, and easy to understand. They combine the easiness of
use of traditional static signs with the flexibility and reactiveness of navigation
systems. The Smart Signs system uses context information such
as user’s mobility limitations, the weather, and possible emergency situations
to improve guidance and messaging.
Minimal infrastructure requirements and a simple deployment tool make
it feasible to easily deploy a Smart Signs system on demand.
An important design issue of the Smart Signs system is privacy: the
system secures communication links, does not track users, allow almost
complete anonymous use, and prevent the system to be used as a tool
for spying on users
The state of peer-to-peer network simulators
Networking research often relies on simulation in order to test and evaluate new ideas. An important requirement of this process is that results must be reproducible so that other researchers can replicate, validate and extend existing work. We look at the landscape of simulators for research in peer-to-peer (P2P) networks by conducting a survey of a combined total of over 280 papers from before and after 2007 (the year of the last survey in this area), and comment on the large quantity of research using bespoke, closed-source simulators. We propose a set of criteria that P2P simulators should meet, and poll the P2P research community for their agreement. We aim to drive the community towards performing their experiments on simulators that allow for others to validate their results
Security and Privacy Issues in Wireless Mesh Networks: A Survey
This book chapter identifies various security threats in wireless mesh
network (WMN). Keeping in mind the critical requirement of security and user
privacy in WMNs, this chapter provides a comprehensive overview of various
possible attacks on different layers of the communication protocol stack for
WMNs and their corresponding defense mechanisms. First, it identifies the
security vulnerabilities in the physical, link, network, transport, application
layers. Furthermore, various possible attacks on the key management protocols,
user authentication and access control protocols, and user privacy preservation
protocols are presented. After enumerating various possible attacks, the
chapter provides a detailed discussion on various existing security mechanisms
and protocols to defend against and wherever possible prevent the possible
attacks. Comparative analyses are also presented on the security schemes with
regards to the cryptographic schemes used, key management strategies deployed,
use of any trusted third party, computation and communication overhead involved
etc. The chapter then presents a brief discussion on various trust management
approaches for WMNs since trust and reputation-based schemes are increasingly
becoming popular for enforcing security in wireless networks. A number of open
problems in security and privacy issues for WMNs are subsequently discussed
before the chapter is finally concluded.Comment: 62 pages, 12 figures, 6 tables. This chapter is an extension of the
author's previous submission in arXiv submission: arXiv:1102.1226. There are
some text overlaps with the previous submissio
Systematizing Decentralization and Privacy: Lessons from 15 Years of Research and Deployments
Decentralized systems are a subset of distributed systems where multiple
authorities control different components and no authority is fully trusted by
all. This implies that any component in a decentralized system is potentially
adversarial. We revise fifteen years of research on decentralization and
privacy, and provide an overview of key systems, as well as key insights for
designers of future systems. We show that decentralized designs can enhance
privacy, integrity, and availability but also require careful trade-offs in
terms of system complexity, properties provided, and degree of
decentralization. These trade-offs need to be understood and navigated by
designers. We argue that a combination of insights from cryptography,
distributed systems, and mechanism design, aligned with the development of
adequate incentives, are necessary to build scalable and successful
privacy-preserving decentralized systems
Internet Censorship: An Integrative Review of Technologies Employed to Limit Access to the Internet, Monitor User Actions, and their Effects on Culture
The following conducts an integrative review of the current state of Internet Censorship in China, Iran, and Russia, highlights common circumvention technologies (CTs), and analyzes the effects Internet Censorship has on cultures. The author spends a large majority of the paper delineating China’s Internet infrastructure and prevalent Internet Censorship Technologies/Techniques (ICTs), paying particular attention to how the ICTs function at a technical level. The author further analyzes the state of Internet Censorship in both Iran and Russia from a broader perspective to give a better understanding of Internet Censorship around the globe. The author also highlights specific CTs, explaining how they function at a technical level. Findings indicate that among all three nation-states, state control of Internet Service Providers is the backbone of Internet Censorship. Specifically, within China, it is discovered that the infrastructure functions as an Intranet, thereby creating a closed system. Further, BGP Hijacking, DNS Poisoning, and TCP RST attacks are analyzed to understand their use-case within China. It is found that Iran functions much like a weaker version of China in regards to ICTs, with the state seemingly using the ICT of Bandwidth Throttling rather consistently. Russia’s approach to Internet censorship, in stark contrast to Iran and China, is found to rely mostly on the legislative system and fear to implement censorship, though their technical level of ICT implementation grows daily. TOR, VPNs, and Proxy Servers are all analyzed and found to be robust CTs. Drawing primarily from the examples given throughout the paper, the author highlights the various effects of Internet Censorship on culture – noting that at its core, Internet Censorship destroys democracy
QuNetSim: A Software Framework for Quantum Networks
As quantum internet technologies develop, the need for simulation software
and education for quantum internet rises. QuNetSim aims to fill this need.
QuNetSim is a Python software framework that can be used to simulate quantum
networks up to the network layer. The goal of QuNetSim is to make it easier to
investigate and test quantum networking protocols over various quantum network
configurations and parameters. The framework incorporates many known quantum
network protocols so that users can quickly build simulations and beginners can
easily learn to implement their own quantum networking protocols.Comment: 11 pages, 6 figure
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