HIBE With Short Public Parameters Without Random Oracle
نویسندگان
چکیده
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.
منابع مشابه
On (Hierarchical) Identity Based Encryption Protocols with Short Public Parameters (With an Exposition of Waters' Artificial Abort Technique)
At Eurocrypt 2005, Waters proposed an efficient identity based encryption (IBE) scheme. One drawback of this scheme is that the size of the public parameter is rather large. Our first contribution is a generalization of Waters scheme. In particular, we show that there is an interesting trade-off between the tightness of the security reduction and smallness of the public parameter size. For a gi...
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تاریخ انتشار 2006