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A proposal for a payment system for public transport based on the ubiquitous paradigm Carmelo R. García, Ricardo Pérez, Joaquín Caraballo, Francisco Alayón, and Gabino Padrón Dpto. Informática y Sistemas, Universidad de Las Palmas de Gran Canaria, Edificio de Informática y Matemáticas, Campus Universitario de Tafira, 35017 Las Palmas , Spain (rgarcia, rperez, falayon, gpadron)@dis.ulpgc.es Abstract. Automatic payment systems (APS) play an important role in the productive activity of the passengers transport companies. The companies using APSs profit from an improved security and commercial speed and their clients from a reduction in the trip cost. We describe how to apply the ubiquitous paradigm in order to improve APSs and present an APS model that allow clients to use different mobile devices such as contactless smart cards, cellular phones or PDAs as means of payment. The system has the necessary mechanisms to be used in a combined way in different services contexts (public transpor...