Welcome to the resource topic for 2024/614
Title:
Non-interactive Blind Signatures from Lattices
Authors: Foteini Baldimtsi, Jiaqi Cheng, Rishab Goyal, Aayush Yadav
Abstract:Blind signatures enable a receiver to obtain signatures on messages of its choice without revealing any message to the signer. Round-optimal blind signatures are designed as a two-round interactive protocol between a signer and receiver. Coincidentally, the choice of message is not important in many applications, and is routinely set as a random (unstructured) message by a receiver.
With the goal of designing more efficient blind signatures for such applications, Hanzlik (Eurocrypt '23) introduced a new variant called non-interactive blind signatures (NIBS). These allow a signer to asynchronously generate partial signatures for any recipient such that only the intended recipient can extract a blinded signature for a random message. This bypasses the two-round barrier for traditional blind signatures, yet enables many known applications.
Hanzlik provided new practical designs for NIBS from bilinear pairings. In this work, we investigate efficient NIBS with post-quantum security. We design the first practical NIBS, as well as non-interactive partially blind signatures called tagged NIBS, from lattice-based assumptions. We also propose a new generic paradigm for NIBS from circuit-private leveled homomorphic encryption achieving optimal-sized signatures (i.e., same as any non-blind signature). Finally, we propose new enhanced security properties for NIBS, that could be of practical and theoretical interest.
ePrint: https://eprint.iacr.org/2024/614
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