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New Revocable IBE in Prime-Order Groups: Adaptively Secure, Decryption Key Exposure Resistant, and with Short Public Parameters

  • Yohei Watanabe
  • Keita Emura
  • Jae Hong Seo
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 10159)

Abstract

Revoking corrupted users is a desirable functionality for cryptosystems. Since Boldyreva, Goyal, and Kumar (ACM CCS 2008) proposed a notable result for scalable revocation method in identity-based encryption (IBE), several works have improved either the security or the efficiency of revocable IBE (RIBE). Currently, all existing scalable RIBE schemes that achieve adaptively security against decryption key exposure resistance (DKER) can be categorized into two groups; either with long public parameters or over composite-order bilinear groups. From both practical and theoretical points of views, it would be interesting to construct adaptively secure RIBE scheme with DKER and short public parameters in prime-order bilinear groups.

In this paper, we address this goal by using Seo and Emura’s technique (PKC 2013), which transforms the Waters IBE to the corresponding RIBE. First, we identify necessary requirements for the input IBE of their transforming technique. Next, we propose a new IBE scheme having several desirable properties; satisfying all the requirements for the Seo-Emura technique, constant-size public parameters, and using prime-order bilinear groups. Finally, by applying the Seo-Emura technique, we obtain the first adaptively secure RIBE scheme with DKER and constant-size public parameters in prime-order bilinear groups.

Keywords

Revocable identity-based encryption Static assumptions Asymmetric pairings 

Notes

Acknowledgments

We would like to thank anonymous reviewers for valuable comments. Yohei Watanabe was supported by Grant-in-Aid for JSPS Fellows Grant Number JP16J10532. Keita Emura was supported by JSPS KAKENHI Grant Number JP16K00198.

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  1. 1.The University of Electro-CommunicationsTokyoJapan
  2. 2.National Institute of Advanced Industrial Science and Technology (AIST)TokyoJapan
  3. 3.National Institute of Information and Communications Technology (NICT)TokyoJapan
  4. 4.Myongji UniversityYonginKorea

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