zkDaily - 2026-03-25

零知识证明 zkDaily

ZKP Frontier Tracker 🎯

Wed

03.25

2026

A Universal Blinder: One-round Blind Signatures from FHE

Paper

https://eprint.iacr.org/2026/574

Dan Boneh Blind Signature FHE

Boneh and Kim propose a universal compiler in their paper, converting any signature scheme into a one-round blind signature scheme using FHE and ZKP to ensure unforgeability and blindness while maintaining backward compatibility.

Notes

Proposes a universal compiler converting any signature scheme to a one-round blind signature scheme
Uses FHE and ZKP to ensure unforgeability and blindness
Blind signature format matches underlying scheme for backward compatibility
Offers three compiler variants based on workload distribution between client and signer
Introduces new concept of committed verifiable FHE where verifier doesn't see circuit in clear
Has significant potential in public-key cryptography applications

Collected by @icerdesign

零知识证明 zkDaily

Q&A Deep Dive 💬

Wed

03.25

2026

What is the main contribution of this paper?

The paper introduces a compiler that converts any signature scheme into a one-round blind signature scheme. The resulting signature has the exact same format as the original, ensuring backward compatibility.

Why can this scheme achieve one-round interaction?

Traditional blind signatures require multiple rounds for hiding and verification. Here, FHE and zero-knowledge proofs combine computation and correctness checks in one step, removing extra rounds.

What is committed verifiable FHE and why is it important?

It is a form of verifiable FHE where the verifier does not see the circuit, only commitments to it. This improves privacy while ensuring correctness, which is crucial for blindness and unforgeability.

Prompted by @icerdesign