ThePKC2000conferencewasheldattheMelbourneExhibitionCentre, Victoria, Australia, January 18-20, 2000. It was the third conference in the international workshop series dedicated to practice and theory in public key cryptography. The program committee of the conference received 70 full submissions from around the world, of which 31 were selected for presentation. All submissions were reviewed by experts in the relevant areas. The program committee consisted of 19 experts in cryptography and data se- rity drawn from the international research community, these being Chin-Chen Chang (National Chung Cheng University, Taiwan), Claude Cr¿ epeau (McGill University, Canada), Ed Dawson (Queensland University of Technology, A- tralia), Yvo Desmedt (Florida State University, USA), Hideki Imai (Co-chair, UniversityofTokyo, Japan), MarkusJakobsson(BellLabs, USA), KwangjoKim (Information and Communications University, Korea), Arjen Lenstra (Citibank, USA), TsutomuMatsumoto(YokohamaNationalUniversity, Japan), DavidN- cache (Gemplus, France), Eiji Okamoto (University of Wisconsin-Milwaukee, USA), TatsuakiOkamoto(NTTLabs, Japan), JosefPieprzyk(UniversityofW- longong, Australia), Jean-Jacques Quisquater (Universit¿ e Catholique de L- vain, Belgium), Nigel Smart (HP Labs Bristol, UK), Vijay Varadharajan (U- versity of Western Sydney, Australia), Serge Vaudenay (Ecole Polytechnique F¿ ed¿ erale de Lausanne, Switzerland), Moti Yung (CertCo, USA), and Yuliang Zheng (Co-chair, Monash University, Australia). Members of the committee spent numerous hours in reviewing the submissions and providing advice and comments on the selection of papers.