Welcome to the resource topic for 2021/515
Title:
Generic Constructions of Revocable Hierarchical Identity-based Encryption
Authors: Keita Emura, Atsushi Takayasu, 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.
ePrint: https://eprint.iacr.org/2021/515
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