This is a proof of concept implementation that combines a classical and post quantum digital signature scheme. NIST Round 3 implementation of Falcon and EdDSA (ed25519) implementation from <a href="https://tweetnacl.cr.yp.to/" rel="nofollow">https://tweetnacl.cr.yp.to/</a> is used.<p>This hybrid implementation is a short term hedge against known lattice based cryptography schemes getting broken.