X.509 Certificate

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Security

The International Organization for Standardization/International Telecommunication Union Standardization Department (ISO/ITU-T) X.509 standard defined two types of certificates the X.509 public key certificate, and the X.509 attribute certificate. Most commonly (including this document), an X.509 certificate refers to the X.509 public key certificate.

NIST — Glossary of Key Information Security Terms