Understanding the challenges and operational requirements of the PKI-related through the sharing of case studies is essential to support advanced research and development of PKI technology and related systems and applications for further progress and innovate to enhance future development and evolution of PKI in the enterprise. This publication covers topics including: PKI Operations & Case Studies, Non-repudiation, Authorization & Access Control, Authentication & Time-Stamping, Certificate Validation & Revocation, and Applied Cryptography. IOS Press is an international scientific, technical and medical publisher of high-quality books for academics, scientists, and professionals in all fields.