Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

    Glossary
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Entity registration

Definitions:

  A function in the lifecycle of a cryptographic key; a process whereby an entity becomes a member of a security domain.
Sources:
NIST SP 800-57 Part 1 Rev. 5