Algorithms
What is FN-DSA?
Also known as Falcon.
FFT-over-NTRU-Lattices Digital Signature Algorithm. NIST signature standard scheduled as FIPS 206 (draft). Two parameter sets (512, 1024). Smaller signatures than ML-DSA, used by QNSP for code-signing and TLS certificates where on-wire size matters.
Deep dive
FN-DSA on QNSP
NIST's fourth standardised PQC signature scheme, formally FN-DSA under FIPS 206 — the initial public draft is still pending as of mid-2026. Falcon's signatures are the most compact of the lattice-based PQC schemes, making it preferred for size-constrained transport.
For parameter sets, key and signature sizes, NIST ACVP conformance status, and when to use it, see the full FN-DSA algorithm reference.
FAQ
Common questions
What is FN-DSA?
FFT-over-NTRU-Lattices Digital Signature Algorithm. NIST signature standard scheduled as FIPS 206 (draft). Two parameter sets (512, 1024). Smaller signatures than ML-DSA, used by QNSP for code-signing and TLS certificates where on-wire size matters.
What is FN-DSA also known as?
FN-DSA is also known as Falcon. FFT-over-NTRU-Lattices Digital Signature Algorithm. NIST signature standard scheduled as FIPS 206 (draft). Two parameter sets (512, 1024). Smaller signatures than ML-DSA, used by QNSP for code-signing and TLS certificates where on-wire size matters.
More