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- ITU Recommendation X.509
- Official web pages containing the standards published by the International Telecommunication Union.
- Digital ID Introduction
Introductory level overview of digital certificates. - Handbook of Applied Cryptography
Introduction to the practical aspects of conventional and public-key cryptography. (PDF and Postscript sample chapters) - RFC 4158: Internet X.509 Public Key Infrastructure: Certification Path Building
Provides guidance and recommendations to developers building X.509 public-key certification paths within their applications. - Wikipedia: X.509
Encyclopedia article about the ITU-T standard for a public key infrastructure. Includes history, certificate details, and references. - X.509 Style Guide
Document by Peter Gutmann intended as a set of implementation notes and guidelines for developers.
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