CryptoNext Security sn3rd The Fast-Fourier Transform over NTRU-Lattice-Based Digital Signature Algorithm (FN-DSA), as defined by NIST in FIPS 206, is a post-quantum digital signature scheme that aims to be secure against an adversary in possession of a Cryptographically Relevant Quantum Computer (CRQC). This document specifies the conventions for using the FN-DSA signature algorithm with the Cryptographic Message Syntax (CMS). In addition, the algorithm identifier is provided.