Supersingular Isogeny-based Ring Signature

Year 2023, Volume: 12 Issue: 1, 32 - 57, 10.03.2023

Maryam Sheikhi Garjan N. Gamze Orhon Kılıç Murat Cenk

https://doi.org/10.55859/ijiss.1187756

Abstract

The increasing demand for secure and anonymous transactions raises the popularity of ring signatures, which is a digital signature scheme that allows identifying a group of possible signers without revealing the identity of the actual signer. This paper presents efficient supersingular isogeny-based ring signature and linkable ring signature schemes that will find potential applications in post-quantum technologies. We develop the ring signature scheme by applying the Fiat-Shamir transform on the sigma protocol for a ring which we obtain from the supersingular isogeny-based interactive zero-knowledge identification scheme by adopting the scheme for a ring. We also extend our ring signature protocol with an additional parameter, i.e., a tag that provides to detect if a signer issues two signatures concerning the same ring by preserving anonymity and linkable anonymity. The signature size of our ring signature protocols increases logarithmically in the size of the ring thanks to the Merkle trees. We show the security proofs and efficiency analyses of the protocols offered. Moreover, we provide the implementation results of the supersingular isogeny-based ring signature, which offers small signature sizes for NIST post-quantum security levels.

Keywords

linkable ring signature, post-quantum cryptography, ring signature, supersingular isogeny

Supporting Institution

TUBITAK

Project Number

120E06

Thanks

M. Sheikhi Garjan was a postdoctoral researcher at Middle East Technical University during a period of this research and would like to thank the Institute of Applied Mathematics Cryptography Department for the hospitality. N. G. Orhon Kılıc ̧ was supported by the Council of Higher Education (YOK) 100/2000 CoHE Ph.D. Scholarship and would like to thank the Council of Higher Education. A part of this paper was written while M. Cenk was visiting the University of Waterloo and would like to thank the Department of Combinatorics & Optimization for hospitality.

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