IACR News item: 01 January 2014
Seunghwan Park, Kwangsu Lee, Dong Hoon Lee
ePrint Report- We first devise a new technique for RIBE that combines hierarchical IBE (HIBE) scheme and a public-key broadcast encryption (PKBE) scheme by 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 3-leveled multilinear maps that combines the HIBE scheme of Boneh and Boyen and the PKBE scheme of Boneh, Gentry, and Waters. The private key and update key of our scheme have a constant number of group elements. To prove the security of our scheme, we introduce a new complexity assumption in multilinear maps, and prove its security in the selective revocation list model.
- Next, we propose another RIBE scheme that reduces the number of public parameters by using the parallel construction technique of PKBE. We could reduce the number of public parameters by using the fact that only the trusted authority in RIBE can broadcast an update key.
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