(2026-02) Distributed Monotone-Policy Encryption with Silent Setup from Lattices
2026-02-23
Distributed cryptography serves as a cornerstone for building trustless systems, yet existing solutions for distributed policy encryption typically require either a trusted dealer or complex interactive setup protocols. Recent advances have introduced the concept of , where users independently generate keys and a joint public key is derived deterministically. However, all current silent-setup constructions rely on bilinear pairings, leaving them vulnerable to quantum adversaries. In this work, we present the first distributed monotone-policy encryption scheme with silent setup based on lattices. Our construction supports arbitrary monotone policies represented as Disjunctive Normal Forms (DNFs) and provides a robust, post-quantum foundation for decentralized access control.