CCA-Secure Leakage-Resilient Identity-Based  Key-Encapsulation from Simple (not $\mathtt{q}$-type) Assumptions

Toi Tomita; Wakaha Ogata; Kaoru Kurosawa; Ryo Kuwayama

Paper 2019/982 Original: eprint.iacr.org/2019/982 ↗

CCA-Secure Leakage-Resilient Identity-Based Key-Encapsulation from Simple (not $\mathtt{q}$-type) Assumptions

Toi Tomita

Wakaha Ogata

Kaoru Kurosawa

Ryo Kuwayama

Abstract

In this paper, we propose a new leakage-resilient identity-based encryption (IBE) scheme that is secure against chosen-ciphertext attacks (CCA) in the bounded memory leakage model. It is the first CCA-secure leakage-resilient IBE scheme which does not depend on $\mathtt{q}$-type assumptions. More precisely, it is secure under the external k-Linear assumption. The leakage rate 1/10 is achieved under the XDLIN assumption.

Metadata

Available format(s): PDF
Category: Public-key cryptography
Publication info: Preprint.
History: 2019-11-29: last updated; 2019-08-29: published
Short URL: https://ia.cr/2019/982
License: https://creativecommons.org/licenses/by/4.0/

BibTeX

@misc{cryptoeprint:2019/982,
      author = {Toi Tomita and Wakaha Ogata and Kaoru Kurosawa and Ryo Kuwayama},
      title = {CCA-Secure Leakage-Resilient Identity-Based  Key-Encapsulation from Simple (not $\mathtt{q}$-type) Assumptions},
      howpublished = {Cryptology {ePrint} Archive, Paper 2019/982},
      year = {2019},
      url = {https://eprint.iacr.org/2019/982}
}