The 2009 European PKI Workshop (EuroPKI'09) will be the sixth event in the EuroPKI Workshops series. The European PKI Workshop series is focusing on all Research aspects of Public Key Services, Applications and Infrastructures. Previous EuroPKI workshops were held in Samos (EuroPKI'04), Kent (EuroPKI'05), Torino (EuroPKI'06), Mallorca (EuroPKI'07), and Trondheim (EuroPKI'08). The EuroPKI'09 workshop venue is Pisa, Tuscany, Italy. The event is organized by the Institute of Informatics and Telematics of the National Council of Research (IIT-CNR).