Abstract
A revocable identity-based encryption (RIBE) provides an efficient revocation method in IBE that a trusted authority periodically broadcasts an update key for nonrevoked users and a user can decrypt a ciphertext if he is not revoked in the update key. Boldyreva, Goyal, and Kumar (CCS 2008) defined RIBE and proposed an RIBE scheme that uses a tree-based revocation encryption scheme to revoke users’ private keys. In this paper, we devise a new technique for RIBE and propose RIBE schemes with a constant number of private key elements. We achieve the following results. We first devise a new technique for RIBE that combines a hierarchical IBE (HIBE) scheme and a public-key broadcast encryption (PKBE) scheme using multilinear maps. In contrast to the previous technique for RIBE, our technique uses a PKBE scheme in bilinear maps for revocation to achieve short private keys and update keys. Following our new technique for RIBE, we propose an RIBE scheme in three-leveled multilinear maps that combines the HIBE scheme of Boneh and Boyen (EUROCRYPT 2004) and the PKBE scheme of Boneh, Gentry, and Waters (CRYPTO 2005). The private key and update key of our scheme possess a constant number of group elements. Next, we propose another RIBE scheme with reduced public parameters and short keys by combining the HIBE scheme of Boneh and Boyen and the PKBE scheme of Boneh, Waters, and Zhandry (CRYPTO 2014), which uses multilinear maps. Compared with our first RIBE scheme, our second RIBE scheme requires high-leveled multilinear maps.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
More From: IEEE Transactions on Information Forensics and Security
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.