HIBE with short public parameters without random oracle

Authors:
Sanjit Chatterjee;Palash Sarkar
Affiliations:
Applied Statistics Unit, Indian Statistical Institute, Kolkata, India;Applied Statistics Unit, Indian Statistical Institute, Kolkata, India
Venue:
ASIACRYPT'06 Proceedings of the 12th international conference on Theory and Application of Cryptology and Information Security
Year:
2006

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Abstract

At Eurocrypt 2005, Waters presented an identity based encryption (IBE) protocol which is secure in the full model without random oracle. In this paper, we extend Waters' IBE protocol to a hierarchical IBE (HIBE) protocol which is secure in the full model without random oracle. The only previous construction in the same setting is due to Waters. Our construction improves upon Waters' HIBE by significantly reducing the number of public parameters.