NIST is primarily interested in additional general-purpose signature schemes that are not based on structured lattices. For certain applications, such as certificate transparency, NIST may also be interested in signature schemes that have short signatures and fast verification. NIST is open to receiving additional submissions based on structured lattices, but is intent on diversifying the post-quantum signature standards. As such, any structured lattice-based signature proposal would need to significantly outperform CRYSTALS-Dilithium and FALCON in relevant applications and/or ensure substantial additional security properties to be considered for standardization.
Security and Privacy: digital signatures, post-quantum cryptography