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Dot gov

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

Https

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

    Glossary
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guard (system)

Definition(s):

  A computer system that (a) acts as gateway between two information systems operating under different security policies and (b) is trusted to mediate information data transfers between the two. See transfer cross domain solution.
Source(s):
CNSSI 4009-2015 from IETF RFC 4949 Ver 2