A Practical Forward-Secure DualRing

Nan Li; Yingjiu Li; Atsuko Miyaji; Yangguang Tian; Tsz Hon Yuen

Paper 2021/1483

A Practical Forward-Secure DualRing

Nan Li, Yingjiu Li, Atsuko Miyaji, Yangguang Tian, and Tsz Hon Yuen

Abstract

Ring signature allows a signer to generate a signature on behalf of a set of public keys, while a verifier can verify the signature without identifying who the actual signer is. In Crypto 2021, Yuen et al. proposed a new type of ring signature scheme called DualRing. However, it lacks forward security. The security of DualRing cannot be guaranteed if the signer's secret key is compromised. In this work, we introduce forward-secure DualRing. The singer can periodically update his secret key using our proposed ``split-and-combine" method to mitigate the security risks caused by the leakage of secret keys. We present a practical scheme based on the discrete logarithm assumption. We show a detailed evaluation to validate its practicality.

Metadata

Available format(s): PDF
Category: Public-key cryptography
Publication info: Preprint. MINOR revision.
Keywords: DualRing Forward Security Practical Scheme
Contact author(s): sunshine tian86 @ gmail com
History: 2021-11-08: received
Short URL: https://ia.cr/2021/1483
License: CC BY

BibTeX

@misc{cryptoeprint:2021/1483,
      author = {Nan Li and Yingjiu Li and Atsuko Miyaji and Yangguang Tian and Tsz Hon Yuen},
      title = {A Practical Forward-Secure {DualRing}},
      howpublished = {Cryptology {ePrint} Archive, Paper 2021/1483},
      year = {2021},
      url = {https://eprint.iacr.org/2021/1483}
}