NIST.SP.800-38is a NIST Special Publication titled as "Recommendation for Block Cipher Modes of Operation: Methods and Techniques"

NIST.SP.800-38 defines Block Cipher Modes of operation for use with an underlying Symmetric Key Block Cipher algorithm:

Used with an underlying Block Cipher algorithm that is approved in a Federal Information Processing Standard (FIPS), these Block Cipher Modes can provide cryptographic protection for sensitive, but unclassified, computer data.

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