Direct chosen-ciphertext secure hierarchical ID-based encryption schemes

Authors:
Jong Hwan Park;Dong Hoon Lee
Affiliations:
Center for Information Security Technologies, Korea University, Seoul, Korea;Center for Information Security Technologies, Korea University, Seoul, Korea
Venue:
EuroPKI'07 Proceedings of the 4th European conference on Public Key Infrastructure: theory and practice
Year:
2007

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Abstract

We describe two Hierarchical Identity Based Encryption (HIBE) schemes which are selective-ID chosen ciphertext secure. Our constructions are based on the Boneh-Boyen and the Boneh-Boyen-Goh HIBE schemes respectively. We apply the signature-based method to their HIBE schemes. The proposed l-level HIBE schemes are directly derived from l-level HIBE schemes secure against chosen plaintext attacks without padding on identities with one-bit. This is more compact than the known generic transformation suggested by Canetti et al..