Attacks Against the INDCPA-D Security of Exact FHE Schemes

ePrint Report: Attacks Against the INDCPA-D Security of Exact FHE Schemes

Jung Hee Cheon, Hyeongmin Choe, Alain Passelègue, Damien Stehlé, Elias Suvanto

A new security model for fully homomorphic encryption (FHE), called INDCPA-D security and introduced by Li and Micciancio [Eurocrypt'21], strengthens INDCPA-D security by giving the attacker access to a decryption oracle for ciphertexts for which it should know the underlying plaintexts. This includes ciphertexts that it (honestly) encrypted and those obtained from the latter by evaluating circuits that …

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