The load-bearing documents for a DIB program — CMMC / DFARS regulatory text (eCFR), federal rulemaking, NIST publications and OIRA review — organized as a library. Pick a document; the reader shows the dex dossier: what it says, why it matters, and the concrete obligations it imposes. Originals open at the source.
SP 800-38D Rev. 1, Second Pre-Draft Call for Comments: GCM and GMAC Block Cipher Modes of Operation2nd Preliminary Draft
NIST is seeking public feedback on proposed revisions to SP 800-38D, specifically regarding GCM tag sizes, IV handling, and the specification of a new wGCM mode.
NIST is revising Special Publication 800-38D to update the Galois/Counter Mode (GCM) and propose a new wider variant called wGCM. The document outlines specific questions regarding GCM tag lengths (removing support for tags less than 96 bits), variable-length IVs, and the parameters for wGCM, including its block size, tag sizes, IV constructions, and hash function options. The public comment period for these proposed changes is open through July 31, 2026.
DIBs must monitor NIST cryptographic standards updates to ensure their systems remain compliant with evolving encryption requirements, particularly as new modes like wGCM and revised GCM parameters could impact the validation status of their cryptographic implementations.