Anonymous (Hierarchical) Identity-Based Encryption from Broader Assumptions
Refereed conference paper presented and published in conference proceedings
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AbstractDöttling and Garg (CRYPTO 2017) introduced a non-black-box approach to identity-based encryption (IBE). This paves the way for the first and still the only anonymous IBE (AIBE) scheme from the computational Diffie–Hellman (CDH) assumption of Brakerski et al. (EUROCRYPT 2018). This paper revisits the blinding technique of Brakerski et al. and introduces a suite of blind primitives, extending chameleon encryption, hash encryption, and one-time signature with encryption. Using them, we propose an AIBE scheme from CDH with improved efficiency compared to Brakerski et al., especially in the decryption time. We also propose the first anonymous hierarchical IBE (AHIBE) scheme from CDH and the first AIBE and AHIBE schemes from the ϕ-hiding assumption, with similar efficiency as their non-anonymous counterparts.
Acceptance Date17/03/2023
All Author(s) ListWu H, Chow SSM
Name of ConferenceApplied Cryptography and Network Security (ACNS) 2023
Start Date of Conference19/06/2023
End Date of Conference22/06/2023
Place of ConferenceKyoto
Country/Region of ConferenceJapan
Proceedings TitleInternational Conference on Applied Cryptography and Network Security
Book titleApplied Cryptography and Network Security
Series TitleLecture Notes in Computer Science
Number in Series13906
Year2023
Month6
PublisherSpringer Nature Switzerland
Place of PublicationSwitzerland
Pages366 - 395
ISBN978-3-031-33490-0
eISBN978-3-031-33491-7
ISSN0302-9743
eISSN1611-3349
LanguagesEnglish-United States
Keywordsidentity-based encryption, hierarchical IBE, anonymity, computational Diffie-Hellman, φ-hiding
