    @article {JordiForne2009,
	title = {Pervasive Authentication and Authorization Infrastructures for Mobile Users},
	journal = {Computer and Security},
	volume = {29},
	year = {2010},
	pages = {501-514},
	publisher = {elsevier},
	abstract = {<p>Network and device heterogeneity, nomadic mobility, intermittent connectivity and, more generally, extremely dynamic operating conditions, are major challenges in the design of security infrastructures for pervasive computing. Yet, in a ubiquitous computing environment, limitations of traditional solutions for authentication and authorization can be overcome with a pervasive public key infrastructure (pervasive-PKI). This choice allows the validation of credentials of users roaming between heterogeneous networks, even when global connectivity is lost and some services are temporarily unreachable. Proof-of-concept implementations and testbed validation results demonstrate that strong security can be achieved for users and applications through the combination of traditional PKI services with a number of enhancements like: (i) dynamic and collaborative trust model, (ii) use of attribute certificates for privilege management, and (iii) modular architecture enabling nomadic mobility and enhanced with reconfiguration capabilities.</p>},
	issn = {0167-4048},
	doi = {10.1016/j.cose.2009.09.001},
	author = {Jordi Forne and Francisca Hinajeros and Andres Marin and Florina Almenarez and Javier Lopez and Jose A. Montenegro and Marc Lacoste and Daniel Diaz}
}
