@techreport{ietf-lamps-pq-composite-sigs-19, number = {draft-ietf-lamps-pq-composite-sigs-19}, type = {Internet-Draft}, institution = {Internet Engineering Task Force}, publisher = {Internet Engineering Task Force}, note = {Work in Progress}, url = {https://datatracker.ietf.org/doc/draft-ietf-lamps-pq-composite-sigs/19/}, author = {Mike Ounsworth and John Gray and Massimiliano Pala and Jan Klaußner and Scott Fluhrer}, title = {{Composite Module-Lattice-Based Digital Signature Algorithm (ML-DSA) for use in X.509 Public Key Infrastructure}}, pagetotal = 234, year = 2026, month = apr, day = 21, abstract = {This document defines combinations of US NIST Module-Lattice-Based Digital Signature Algorithm (ML-DSA) in hybrid with traditional algorithms RSASSA-PKCS1-v1.5, RSASSA-PSS, ECDSA, Ed25519, and Ed448. These combinations are tailored to meet regulatory guidelines in certain regions. Composite ML-DSA is applicable in applications that use X.509 or PKIX data structures that accept ML-DSA, but where the operator wants extra protection against breaks or catastrophic bugs in ML-DSA, and where existential unforgeability (EUF-CMA) level security is acceptable.}, }