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Dynamic Decentralized Functional Encryption

Abstract : We introduce Dynamic Decentralized Functional Encryption (DDFE), a generalization ofFunctional Encryption which allows multiple users to join the system dynamically, without relying on atrusted 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 primitivesand may be useful in their own right, such as a scheme for dynamically computing sums in any Abeliangroup. These constructions build upon simple primitives in a modular way, and have instantiations fromwell-studied assumptions, such as DDH or LWE.Our constructions culminate in an Inner-Product scheme for computing weighted sums on aggregatedencrypted data, from standard assumptions in prime-order groups in the Random Oracle Model.
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Submitted on : Thursday, November 5, 2020 - 5:13:45 PM
Last modification on : Wednesday, October 20, 2021 - 1:31:24 AM
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Jérémy Chotard, Edouard Dufour-Sans, Romain Gay, Duong Hieu Phan, David Pointcheval. Dynamic Decentralized Functional Encryption. CRYPTO 2020 - 40th Annual International Cryptology Conference, Aug 2020, Santa Barbara / Virtual, United States. pp.747-775, ⟨10.1007/978-3-030-56784-2_25⟩. ⟨hal-02947359⟩



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