As a part of the periodic review of NIST’s cryptographic standards and guidelines, NIST’s Crypto Publication Review Board announced the review of FIPS 198-1 The Keyed-Hash Message Authentication Code (HMAC) in August 2021. In response, NIST received public comments.
NIST proposes to convert FIPS 198-1 to a NIST Special Publication (SP) and apply the following changes:
- Update the HMAC specification to include block sizes for the SHA-3 family of hash functions
- Include a discussion on truncation
- Improve the editorial quality and update references