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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Additional input

Definitions:

  Information known by two parties that is cryptographically bound to the secret keying material being protected using the encryption operation.
Sources:
NIST SP 800-56B Rev. 2