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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Cyber Security

Definitions:

  The ability to protect or defend the use of cyberspace from cyber attacks.
Sources:
NIST SP 800-30 Rev. 1 from CNSSI 4009
NIST SP 800-39 from CNSSI 4009