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Shortening the Libert-Peters-Yung Revocable Group Signature Scheme by Using the Random Oracle Methodology

Kazuma OHARA, Keita EMURA, Goichiro HANAOKA, Ai ISHIDA, Kazuo OHTA, Yusuke SAKAI

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Summary :

At EUROCRYPT 2012, Libert, Peters and Yung (LPY) proposed the first scalable revocable group signature (R-GS) scheme in the standard model which achieves constant signing/verification costs and other costs regarding signers are at most logarithmic in N, where N is the maximum number of group members. However, although the LPY R-GS scheme is asymptotically quite efficient, this scheme is not sufficiently efficient in practice. For example, the signature size of the LPY scheme is roughly 10 times larger than that of an RSA signature (for 160-bit security). In this paper, we propose a compact R-GS scheme secure in the random oracle model that is efficient not only in the asymptotic sense but also in practical parameter settings. We achieve the same efficiency as the LPY scheme in an asymptotic sense, and the signature size is nearly equal to that of an RSA signature (for 160-bit security). It is particularly worth noting that our R-GS scheme has the smallest signature size compared to those of previous R-GS schemes which enable constant signing/verification costs. Our technique, which we call parallel Boneh-Boyen-Shacham group signature technique, helps to construct an R-GS scheme without following the technique used in LPY, i.e., we directly apply the Naor-Naor-Lotspiech framework without using any identity-based encryption.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E102-A No.9 pp.1101-1117
Publication Date
2019/09/01
Publicized
Online ISSN
1745-1337
DOI
10.1587/transfun.E102.A.1101
Type of Manuscript
Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category
Cryptography and Information Security

Authors

Kazuma OHARA
  The University of Electro-Communications
Keita EMURA
  National Institute of Information and Communications Technology (NICT)
Goichiro HANAOKA
  National Institute of Advanced Industrial Science and Technology
Ai ISHIDA
  National Institute of Advanced Industrial Science and Technology
Kazuo OHTA
  The University of Electro-Communications
Yusuke SAKAI
  National Institute of Advanced Industrial Science and Technology

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