A survey on Functional Encryption

TL;DR

This survey comprehensively reviews all classes of Functional Encryption, detailing their functionalities, schemes, security assumptions, and properties, serving as the first complete overview of the FE family.

Contribution

It provides the first extensive survey covering all FE classes, their schemes, security assumptions, and comparative properties.

Findings

Detailed classification of FE schemes

Comparison of security assumptions across schemes

Identification of research gaps in FE

Abstract

Functional Encryption (FE) expands traditional public-key encryption in two different ways: it supports fine-grained access control and allows learning a function of the encrypted data. In this paper, we review all FE classes, describing their functionalities and main characteristics. In particular, we mention several schemes for each class, providing their security assumptions and comparing their properties. To our knowledge, this is the first survey that encompasses the entire FE family.