[Resource Topic] 2020/197: Dynamic Decentralized Functional Encryption

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Dynamic Decentralized Functional Encryption

Authors: Jérémy Chotard, Edouard Dufour-Sans, Romain Gay, Duong Hieu Phan, David Pointcheval


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.

ePrint: https://eprint.iacr.org/2020/197

Talk: https://www.youtube.com/watch?v=vj-DlswY2Js

Slides: https://iacr.org/submit/files/slides/2020/crypto/crypto2020/405/slides.pdf

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