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- W774911181 abstract "Gentry’s bootstrapping technique is still the only known method of obtaining fully homomorphic encryption where the system’s parameters do not depend on the complexity of the evaluated functions. Bootstrapping involves a recryption procedure where the scheme’s decryption algorithm is evaluated homomorphically. So far, there have been precious few implementations of recryption, and fewer still that can handle “packed ciphertexts” that encrypt vectors of elements. In the current work, we report on an implementation of recryption of fully-packed ciphertexts using the HElib library for somewhat-homomorphic encryption. This implementation required extending the recryption algorithms from the literature, as well as many aspects of the HElib library. Our implementation supports bootstrapping of packed ciphertexts over many extension fields/rings. One example that we tested involves ciphertexts that encrypt vectors of 1024 elements from $${text {GF}}(2^{16})$$ . In that setting, the recryption procedure takes under 5.5 minutes (at security-level $$approx 76$$ ) on a single core, and allows a depth-9 computation before the next recryption is needed." @default.
- W774911181 created "2016-06-24" @default.
- W774911181 creator A5073301367 @default.
- W774911181 creator A5088669734 @default.
- W774911181 date "2015-01-01" @default.
- W774911181 modified "2023-10-06" @default.
- W774911181 title "Bootstrapping for HElib" @default.
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- W774911181 doi "https://doi.org/10.1007/978-3-662-46800-5_25" @default.
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