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Lower Bounds for Lattice-based Compact Functional Encryption
May 22, 2023, 7:12 a.m. |
IACR News www.iacr.org
ePrint Report: Lower Bounds for Lattice-based Compact Functional Encryption
Erkan Tairi, Akın Ünal
Functional encryption (FE) is a primitive where the holder of a master secret key can control which functions a user can evaluate on encrypted data. It is a powerful primitive that even implies indistinguishability obfuscation (iO), given sufficiently compact ciphertexts (Ananth-Jain, CRYPTO'15 and Bitansky-Vaikuntanathan, FOCS'15). However, despite being extensively studied, there are FE schemes, such as function-hiding inner-product FE (Bishop-Jain-Kowalczyk, AC'15, Abdalla-Catalano-Fiore-Gay-Ursu, CRYPTO’18) and compact quadratic FE …
control data encrypted encrypted data encryption eprint report functions key master obfuscation report secret secret key
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