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Originally the field encompassing both cryptography and cryptanalysis. Today, cryptology in the U.S. Government is the collection and/or exploitation of foreign communications and non- communications emitters, known as SIGINT; and solutions, products, and services, to ensure the availability, integrity, authentication, confidentiality, and non-repudiation of national security telecommunications and information systems, known as IA.
NIST SP 800-59 under Cryptology
The mathematical science that deals with cryptanalysis and cryptography.
The science that deals with hidden, disguised, or encrypted communications. It includes communications security and communications intelligence.
NIST SP 800-60 Vol. 1 Rev. 1 under Cryptology
NIST SP 800-60 Vol. 2 Rev. 1 under Cryptology