## Cryptology ePrint Archive: Report 2019/567

(Linkable) Ring Signature from Hash-Then-One-Way Signature

Xingye Lu and Man Ho Au and Zhenfei Zhang

Abstract: In this paper, we revisit the generic construction of ring signatures from hash-then-one-way type ($\mathsf{Type-H}$) signatures proposed by Abe et al. (AOS) in 2004 and made the following contributions. First, we give a proof for the generic construction, in a strengthened security model. Previously, this was only done for concrete instantiations, in a weaker model. Second, we extend AOS's framework to generically construct one-time linkable ring signatures from $\mathsf{Type-H}$ signatures and one-time signatures. Lastly, we instantiate the generic construction with an NTRU-based $\mathsf{Type-H}$ signature: Falcon~and obtain a post-quantum linkable ring signature scheme. Our analysis shows that the resulting linkable signature is more efficient than any existing lattice based solutions for small to moderate number of users.

Category / Keywords: public-key cryptography / ring signature; linkable ring signature; lattice-based cryptography

Original Publication (with major differences): TrustCom 2019