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Paper 2021/515

Generic Constructions of Revocable Hierarchical Identity-based Encryption

Keita Emura and Atsushi Takayasu and Yohei Watanabe

Abstract

Revocable hierarchical identity-based encryption (RHIBE) is an extension of hierarchical identity-based encryption (HIBE) supporting the key revocation mechanism. In this paper, we propose a generic construction of RHIBE from HIBE with the complete subtree method. Then, we obtain the first RHIBE schemes under the quadratic residuosity assumption, CDH assumption without pairing, factoring Blum integers, LPN assumption, and code-based assumption, and the first almost tightly secure RHIBE schemes under the k-linear assumption. Furthermore, by using pairing-based (dual) identity-based broadcast encryption, we obtain the variants of the scheme with shorter ciphertexts or shorter key updates.

Metadata
Available format(s)
PDF
Category
Public-key cryptography
Publication info
Preprint. MINOR revision.
Contact author(s)
k-emura @ nict go jp,takayasu @ nict go jp,watanabe @ uec ac jp
History
2021-04-23: received
Short URL
https://ia.cr/2021/515
License
Creative Commons Attribution
CC BY
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