Poster: Efficient Threshold ML-DSA up to 6 Parties

Threshold signature schemes enable a group of users to collaboratively produce digital signatures without revealing any individual share. With the current NIST post-quantum standardization underway, the lack of efficient and practical threshold variants of standardized schemes hinders adoption. We introduce the first threshold signature scheme compatible with the ML-DSA standard (Module-Lattice-based Digital Signature Algorithm), supporting up to 6 parties, while retaining efficient signing. Our work uses advanced short secret sharing techniques and optimized rejection sampling to balance communication and correctness in distributed settings. We implement our construction in Go and benchmark it in local, LAN, and WAN deployments. Results show that our threshold ML-DSA is both practical and compatible with real-world applications such as multi-device cryptocurrency wallets, threshold TLS, and Tor's directory authorities.