International Association for Cryptologic Research

International Association
for Cryptologic Research

CryptoDB

Zhedong Wang

Publications

Year
Venue
Title
2019
PKC
FE for Inner Products and Its Application to Decentralized ABE
Zhedong Wang Xiong Fan Feng-Hao Liu
In this work, we revisit the primitive functional encryption (FE) for inner products and show its application to decentralized attribute-based encryption (ABE). Particularly, we derive an FE for inner products that satisfies a stronger notion, and show how to use such an FE to construct decentralized ABE for the class $$\{0,1\}$$-$$\mathsf {LSSS} $$ against bounded collusions in the plain model. We formalize the FE notion and show how to achieve such an FE under the LWE or DDH assumption. Therefore, our resulting decentralized ABE can be constructed under the same standard assumptions, improving the prior construction by Lewko and Waters (Eurocrypt 2011). Finally, we also point out challenges to construct decentralized ABE for general functions by establishing a relation between such an ABE and witness encryption for general NP statements.

Coauthors

Xiong Fan (1)
Feng-Hao Liu (1)