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Fuchsbauer, Kiltz, and Loss~(Crypto'18) gave a simple and clean definition of an ￥emph{algebraic group model~(AGM)} that lies in between the standard model and the generic group model~(GGM). Specifica...
Cryptographic reductions typically aim to be tight by transforming an adversary A into an algorithm that uses essentially the same resources as A. In this work we initiate the study of memory efficien...
Collusion Resistant Broadcast Encryption with Tight Reductions and Beyond
Broadcast Encryption Tight Reduction
2016/12/8
The issue of tight security in identity-based encryption scheme (IBE) has been widely investigated.
Recently, a tightly secure IBE scheme of bilinear groups in the weak multi-challenge setting has be...
Tight Reductions among Strong Die-Hellman Assumptions
Tight Reductions Strong Die-Hellman Assumptions
2009/1/19
We derive some tight equivalence reductions between several Strong Die-Hellman
(SDH) assumptions.