The Federal Information Processing Standard 186-4 has been updated since 1994. It uses complex math operations to encrypt and unscramble signatures that are all but impossible to forge. The standard is used to ensure the integrity of electronic documents and the identity of the signer. The changes aim to align the standard with other publications such as Special Publication 131A, Recommendation for Transitioning the Use of Cryptographic Algorithms and Key Lengths, so that all NIST documents offer consistent guidance regarding the use of random number generators.”]
Source: https://www.cuinfosecurity.com/nist-updates-digital-signature-standard-a-5931