In this paper, we first propose the hierarchical IKE scheme without random oracles. Our hierarchical IKE scheme is secure under the symmetric external Diffie-Hellman (SXDH) assumption, which is known as the simple and static one. Particularly, in the non-hierarchical case, our construction is the first IKE scheme that achieves constant-size parameters including public parameters, secret keys, and ciphertexts.
Furthermore, we also propose the first public-key-based key-insulated encryption (PK-KIE) in the hierarchical setting by using our technique.Category / Keywords: public-key cryptography / Key-insulated encryption, Identity-based hierarchical key-insulated encryption, Hierarchical identity-based encryption, Asymmetric pairing Original Publication (with minor differences): IACR-PKC-2016 Date: received 2 Jan 2016, last revised 4 Jan 2017 Contact author: watanabe at uec ac jp Available format(s): PDF | BibTeX Citation Note: Modified constructions and security proofs due to bugs in the proofs. Version: 20170105:061432 (All versions of this report) Short URL: ia.cr/2015/1254 Discussion forum: Show discussion | Start new discussion