Welcome to the resource topic for 2018/847
Title:
Realizing Chosen Ciphertext Security Generically in Attribute-Based Encryption and Predicate Encryption
Authors: Venkata Koppula, Brent Waters
Abstract:We provide generic and black box transformations from any chosen plaintext secure Attribute-Based Encryption (ABE) or One-sided Predicate Encryption system into a chosen ciphertext secure system. Our transformation requires only the IND-CPA security of the original ABE scheme coupled with a pseudorandom generator (PRG) with a special security property. In particular, we consider a PRG with an n bit input s \in {0,1}^n and n\cdot \ell bit output y_1, ..., y_n where each y_i is an \ell bit string. Then for a randomly chosen s the following two distributions should be computationally indistinguishable. In the first distribution r_{i,s_i} = y_i and r_{i, \bar{s}_i} is chosen randomly for i \in [n]. In the second distribution all r_{i,b} are chosen randomly for i \in [n], b \in {0,1}.
ePrint: https://eprint.iacr.org/2018/847
Talk: https://www.youtube.com/watch?v=QEjJjjeC_zA
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