Attribute-Based Multi-Input FE (and more) for Attribute-Weighted Sums

ePrint Report: Attribute-Based Multi-Input FE (and more) for Attribute-Weighted Sums

Shweta Agrawal, Junichi Tomida, Anshu Yadav

Recently, Abdalla, Gong and Wee (Crypto 2020) provided the first functional encryption scheme for attribute-weighted sums (AWS), where encryption takes as input $N$ (unbounded) attribute-value pairs $\{\vec{x}_i, \vec{z}_i\}_{I \in [N]}$ where $\vec{x}_i$ is public and $\vec{z}_i$ is private, the secret key is associated with an arithmetic branching programs $f$, and decryption returns the weighted sum ${\sum}_{{i \in [N]}} f(\vec{x}_i)^\top \vec{z}_i$, leaking no additional information …

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