This book constitutes the thoroughly refereed post-proceedings of the 2nd European Public Key Infrastructure Workshop: Research and Applications, EuroPKI 2005, held in Canterbury, UK, in June/July 2005. The 18 revised full papers presented were carefully reviewed and selected from 43 submissions. The papers are organized in topical sections on authorization, risks/attacks to PKI systems, interoperability between systems, evaluating a CA, ID ring based signatures, new protocols, practical implementations, and long term archiving.