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NSA-approved cryptography

Definitions:

  Cryptography that consists of an approved algorithm, an implementation that has been approved for the protection of classified information and/or controlled unclassified information in a specific environment, and a supporting key management infrastructure.
Sources:
NIST SP 800-171r3 from NIST SP 800-53 Rev. 5
NIST SP 800-53 Rev. 5