Patient telemonitoring systems (PTS) deal with the acquisition, processing, and secure transmission of a patient's physiological and physical parameters to a remote location, where expert medical knowledge is available. In emergency situations, when the patient's life is threatened, the trend in modern PTS is to transmit the current location of the patient. Although research in communications security has led to mechanisms that sufficiently protect medical data, research related to location privacy area is still in its early stages. This paper proposes an architecture that enhances PTS through location privacy and data encryption. We study the most popular PTS technologies in conjunction with location privacy architectures and propose an innovative scheme that exploits a point-to-point protocol called Mist. We describe a prototype implementation, developed for validating the proposed framework along with the corresponding evaluation results.
In most of the wireless sensor networks (WSNs) configurations, the sensors are statically deployed and configured to propagate the captured information towards a sink-sensor, a gateway with legacy systems or the internet. The captured information might be unclassified, such as environmental data, or classified as private information, such as the location of an important asset, person, or actuator. In the latter case, privacy enhancement mechanisms might be essential to ensure the confidentiality of the propagated information, as well as the location of the information source (i.e., a sensor). Light cryptographic cyptosystems, such us Elliptic Curve, might be useful to cipher the information that is relayed towards the sink. On the other hand, the static deployment of sensors in WSN simplifies the reveal of the information source. An eavesdropper might use reverse packet-routing to identify the location of the source sensor, i.e., the one that captured and reported the information. To deal with these issues, and enhance source-location privacy, information secrecy in WSNs, ensure source-to-sink unlinkability, without complex and demanding crypto-operations, we have introduced a novel approach that uses a non--geographical, overlay routing method for packet forwarding, routing, and delivery. This paper introduces the architecture of the approach, and assesses its performance through simulation experiments, providing comparisons with relative approaches.
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