Guideline for Using Cryptographic Standards in the Federa asymmetric-key algorithm; identity authentication; confidentiality; digital signatures; encryption; integrity; key establishment; message authentication; random bit generation; symmetric-key algorithm

Cryptography is often used in an information technology security environment to protect data that is sensitive, has a high value, or is vulnerable to unauthorized disclosure or undetected modification during transmission or while in storage. Cryptography relies upon two basic components: an algorithm (or cryptographic methodology) and a cryptographic key. This Recommendation discusses the generation of the keys to be managed and used by the approved cryptographic algorithms.

This Recommendation provides cryptographic key-management guidance. It consists of three parts. Part 1 provides general guidance and best practices for the management of cryptographic keying material, including definitions of the security services that may be provided when using cryptography and the algorithms and key types that may be employed, specifications of the protection that each type of key and other cryptographic information requires and methods for providing this protection, discussions about the functions involved in key management, and discussions about a variety of key-management issues to be addressed when using cryptography. Part 2 provides guidance on policy and security planning requirements for U.S. government agencies. Part 3 provides guidance when using the cryptographic features of current systems.

This Recommendation specifies techniques for the derivation of keying material from a shared secret established during a key-establishment scheme defined in NIST Special Publications 800-56A or 800-56B.

This Recommendation specifies four types of SHA-3-derived functions: cSHAKE, KMAC, TupleHash, and ParallelHash, each defined for a 128- and 256-bit security strength. cSHAKE is a customizable variant of the SHAKE function, as defined in Federal Information Processing Standard (FIPS) 202. KMAC (for KECCAK Message Authentication Code) is a variable-length message authentication code algorithm based on KECCAK; it can also be used as a pseudorandom function. TupleHash is a variable-length hash function designed to hash tuples of input strings without trivial collisions. ParallelHash is a variable-length hash function that can hash very long messages in parallel.

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