Decentralized Multi-Authority Attribute-Based Inner-Product FE: Large Universe and Unbounded

ePrint Report: Decentralized Multi-Authority Attribute-Based Inner-Product FE: Large Universe and Unbounded

Pratish Datta, Tapas Pal

This paper presents the first decentralized multi-authority attribute-based inner product functional encryption (MA-ABIPFE) schemes supporting vectors of a priori unbounded lengths. The notion of AB-IPFE, introduced by Abdalla et al. [ASIACRYPT 2020], combines the access control functionality of attribute-based encryption (ABE) with the possibility of evaluating linear functions on encrypted data. A decentralized MA-ABIPFE defined by Agrawal et al. [TCC 2021] essentially enhances the ABE …

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