This volume presents the foundational research and applications in Public Key Infrastructure (PKI) from the early 2000s. The proceedings of the First European Public Key Infrastructure Workshop, EuroPKI 2004, gather 25 revised full papers and 5 revised short papers, carefully selected from 73 submissions. These papers explore the multifaceted landscape of PKI, encompassing theoretical underpinnings, practical implementations, and the evolving regulatory frameworks that govern its use. The collection offers a snapshot of the critical issues and advancements in PKI during that period.

The collection represents a significant compilation of early research in Public Key Infrastructure, reflecting the state of the art in 2004. The careful review process, selecting 25 full and 5 short papers from 73 submissions, indicates a high standard for the included research. The breadth of topics covered, from theoretical foundations to regulatory concerns, suggests a comprehensive overview for specialists in the field. This volume serves as a valuable historical document for understanding the evolution of digital security and trust mechanisms.