Juan Hernández Serrano

Shared Self-Organized GKM Protocol for MANETs *

Services in MANETs tend to be decentralized in order to share their cost between their subscribers. Security is not an exception and thus shared self-organized security schemes must be provided. Group Key Management (GKM) deals with the responsibility of providing privacy and group authentication in group communications focusing in the dynamism of the group (joins and leaves). We present a shared self-organized GKM protocol targeted to MANETs. Main basis of the presented protocol is to extend GKM protocols based on logical trees of keys towards being non-centralized and self-created.

Profile-Based Searches on P2P Social Networks

We propose a common vector space to describe documents and users in order to create a social network based on affinities, and explore epidemic algorithms to perform searches based on recommendations. Furthermore, we propose using Fuzzy Distributed Tables to help the localization of isolated, affine clusters.

Managing Privacy in the Internet of Things: DocCloud, a Use Case

In this chapter, we describe nodes in the Internet of Things can configure themselves automatically and offer personalized services to the users while protecting their privacy. We will show how privacy protection can be achieved by means of a use case. We describe DocCloud, a recommender system where users get content recommended by other users based on their personal affinities. To do this, their things connect together based on the affinities of their owners, creating a social network of similar things, and then provide the recommender system on top of this network. We present the architecture of DocCloud and analyze the security mechanisms that the system includes. Specifically, we study the properties of plausible deniability and anonymity of the recommenders and intermediate nodes. In this way, nodes can recommend products to the customers while deny any knowledge about the product they are recommending or their participation in the recommendation process.