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Agusti Solanas, Josep Domingo-Ferrer, Antoni Martínez-Ballesté, Vanesa Daza

Computer Networks 51 (9), 2268-2279

Description: The fast growth of Radio Frequency IDentification (RFID) implies a deployment challenge, namely how to keep this technology scalable without renouncing security and privacy features. This paper focuses on combining tag privacy and scalability using the hash locks mechanism. Our contribution is twofold: (i) a cell-based architecture is proposed in which the readers co-operate in order to conduct tag identification in a private and scalable way; (ii) a communication protocol for the proposed architecture is defined and assessed. The proposed architecture and protocol solve the scalability shortcomings of private RFID identification pointed out by Juels and Weis.

David Rebollo-Monedero, Jordi Forné, Agusti Solanas, Antoni Martínez-Ballesté

Computer Communications 33 (6), 762-774

Description: Privacy and security are paramount in the proper deployment of location-based services (LBSs). We present a novel protocol based on user collaboration to privately retrieve location-based information from an LBS provider. Our approach does not assume that users or providers can be completely trusted with regard to privacy, and does not rely on a trusted third party. In addition, user queries, containing accurate locations, remain unchanged, and the collaborative protocol does not impose any special requirements on the query–response function of the LBS. Our protocol is analyzed in terms of privacy, network traffic, and processing overhead. We define the concept of guaranteed privacy breach probability, and we show that our proposal provides exponential scalability in that probability, at the expense of a linear relative network cost.

Fran Casino, Leyre Azpilicueta, Peio Lopez-Iturri, Erik Aguirre, Francisco Falcone, Agusti Solanas

IEEE Antennas and Wireless Propagation Letters 16, 780-783

Description: Simulation techniques based on deterministic methods such as ray tracing and ray launching are widely used to perform radioplanning tasks. However, the quality of the simulations depends on the number of rays and the angular resolution. The computational cost of these simulations in high definition prevents their use in complex environment, and their low-definition counterparts are used instead. In this letter, we propose a technique based on collaborative filtering to lessen the poor-quality problems of low-definition simulations. We show that our approach obtains results very similar to those of high definition in much less time. Also, we compare our approach to other well-known techniques and show that it performs better in terms of accuracy and precision. The use of combined deterministic/collaborative filtering techniques allows the estimation of radioplanning tasks in large, complex scenarios with a potentially large amount of transceivers.

Carlos E Jimenez, Agusti Solanas, Francisco Falcone

Computer 47 (10), 22-24

Description: As technological advances in data gathering, processing, and management continue, our ability to move from an information society to a "smart" society will increasingly rely on improvements and expansion in technical, organizational, and other aspects of e-government interoperability. The first Web extra at http://youtu.be/sdf8hz7ccbg is a video clip in which guest editor Francisco Falcone expands on the opportunities and challenges of e-government operability. The second Web extra at http://youtu.be/SqJkonPDZHk is a video clip in which guest editor Carlos E. Jiménez speaks in Spanish about the opportunities and challenges of e-government operability.

Constantinos Patsakis, Paul Laird, Michael Clear, Mélanie Bouroche, Agusti Solanas

Computer 48 (1), 52-58

Description: Sharing data via information and communications technology is a fundamental goal of e-government, but data fusion and data mining could reveal sensitive personal information. A proposed cryptographic protocol guarantees citizens' privacy through data aggregation and fosters e-participation in a scalable and interoperable way. The Web extra at http://youtu.be/xTcHNhC3cHw is an audio recording of Computer magazine Editor in Chief Sumi Helal interviewing Constantinos Patsakis about a cryptographic protocol that guarantees citizens privacy through data aggregation and fosters e-participation in a scalable and interoperable way.

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