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Paper 2019/982

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

Toi Tomita and Wakaha Ogata adn Kaoru Kurosawa and 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 DLIN and XDH assumption for symmetric and asymmetric bilinear groups, respectively. The leakage rate 1/6 is achieved under the XDH assumption.

Note: This is an extended version of the paper presented in IWSEC 2019.

Metadata
Available format(s)
PDF
Category
Public-key cryptography
Publication info
Published elsewhere. Major revision. The 14th International Workshop on Security (IWSEC 2019)
Keywords
public-key cryptography
Contact author(s)
ogata w aa @ m titech ac jp
History
2019-11-29: revised
2019-08-29: received
See all versions
Short URL
https://ia.cr/2019/982
License
Creative Commons Attribution
CC BY
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