Welcome to the resource topic for 2024/1956
Title:
MultiReg-FE: Registered FE for Unbounded Inner-Product and Attribute-Weighted Sums
Authors: Qiuyan Du, Qiaohan Chu, Jie Chen, Man Ho Au, Debiao He
Abstract:Recently, Francati et al. (Asiacrypt 2023) provided the first registered functional encryption (Reg-FE) beyond predicates. Reg-FE addresses the key escrow problem in functional encryption by allowing users to generate their own key pairs, effectively replacing the traditional private-key generator with a key curator. The key curator holds no secret information and runs deterministic algorithms to generate master public key for encryption and helper keys for decryption. However, existing Reg-FE schemes under standard assumptions require fixed data sizes, which limits their practicality in real-world applications.
In this work, we introduce Multi-Function Registered Functional Encryption for Inner-Product (MultiReg-FE for IP), a novel extension of Reg-FE. It enables users to register multiple functions under a single public key. With MultiReg-FE, we achieve both Reg-FE for Unbounded Inner-Product (Unbounded IP), which removes the need to predetermine vector lengths, and Reg-FE for Attribute-Weighted Sums with Inner-Product (AWSw/IP), allowing computations over arbitrary numbers of attribute-value pairs.
All our schemes achieve adaptive-IND-security. Specifically, we present:
-MultiReg-FE for Inner-Product, which supports unbounded number of function vectors from each user.
- Reg-FE for Unbounded Inner-Product, removing the need for preset vector lengths.
- The first Reg-FE for AWSw/IP in public-key settings.
ePrint: https://eprint.iacr.org/2024/1956
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