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- W3107842024 abstract "A multi-identity pure fully homomorphic encryption (MIFHE) enables a server to perform arbitrary computation on the ciphertexts that are encrypted under different identities. In case of multi-attribute pure FHE (MAFHE), the ciphertexts are associated with different attributes. Clear and McGoldrick (CANS 2014) gave the first chosen-plaintext attack secure MIFHE and MAFHE based on indistinguishability obfuscation. In this study, we focus on building MIFHE and MAFHE which are secure under type 1 of chosen-ciphertext attack (CCA1) security model. In particular, using witness pseudorandom functions (Zhandry, TCC 2016) and multi-key pure FHE or MFHE (Mukherjee and Wichs, EUROCRYPT 2016) we propose the following constructions:CCA secure identity-based encryption (IBE) that enjoys an optimal size ciphertexts, which we extend to a CCA1 secure MIFHE scheme.CCA secure attribute-based encryption (ABE) having an optimal size ciphertexts, which we transform into a CCA1 secure MAFHE scheme." @default.
- W3107842024 created "2020-12-07" @default.
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- W3107842024 date "2020-01-01" @default.
- W3107842024 modified "2023-09-23" @default.
- W3107842024 title "Chosen-Ciphertext Secure Multi-identity and Multi-attribute Pure FHE" @default.
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- W3107842024 doi "https://doi.org/10.1007/978-3-030-65411-5_19" @default.
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