CryptoDB

Paper: Dynamic Decentralized Functional Encryption

Authors: Jérémy Chotard , ENS, University of Limoges Edouard Dufour-Sans , Carnegie Mellon University Romain Gay , Cornell Tech Duong Hieu Phan , ENS, University of Limoges David Pointcheval , ENS, CNRS, Inria, PSL University DOI: http://dx.doi.org/10.1007/978-3-030-56784-2_25 (login may be required) Search ePrint Search Google Slides CRYPTO 2020 We introduce Dynamic Decentralized Functional Encryption (DDFE), a generalization of Functional Encryption which allows multiple users to join the system dynamically, without relying on a trusted third party or on expensive and interactive Multi-Party Computation protocols. This notion subsumes existing multi-user extensions of Functional Encryption, such as Multi-Input, Multi-Client, and Ad Hoc Multi-Input Functional Encryption. We define and construct schemes for various functionalities which serve as building-blocks for latter primitives and may be useful in their own right, such as a scheme for dynamically computing sums in any Abelian group. These constructions build upon simple primitives in a modular way, and have instantiations from well-studied assumptions, such as DDH or LWE. Our constructions culminate in an Inner-Product scheme for computing weighted sums on aggregated encrypted data, from standard assumptions in prime-order groups in the Random Oracle Model.
BibTeX
@inproceedings{crypto-2020-30473,
title={Dynamic Decentralized Functional Encryption},
publisher={Springer-Verlag},
doi={http://dx.doi.org/10.1007/978-3-030-56784-2_25},
author={Jérémy Chotard and Edouard Dufour-Sans and Romain Gay and Duong Hieu Phan and David Pointcheval},
year=2020
}