This memo profiles the X.509 v3 certificate and X.509 v2 certificate revocation list (CRL) for use in the Internet. An overview of this approach and model is provided as an introduction. The X.509 v3 certificate format is described in detail, with additional information regarding the format and semantics of Internet name forms. Standard certificate extensions are described and two Internet-specific extensions are defined. A set of required certificate extensions is specified. The X.509 v2 CRL format is described in detail along with standard and Internet-specific extensions. An algorithm for X.509 certification path validation is described. An ASN.1 module and examples are provided in the appendices.

This document forms a certificate profile for Qualified Certificates, based on RFC 2459, for use in the Internet. The term Qualified Certificate is used to describe a certificate with a certain qualified status within applicable governing law. Further, Qualified Certificates are issued exclusively to physical persons. The goal of this document is to define a general syntax independent of local legal requirements. The profile is however designed to allow further profiling in order to meet specific local needs. It is important to note that the profile does not define any legal requirements for Qualified Certificates.