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Faster Amortized FHEW bootstrapping using Ring Automorphisms
Jan. 30, 2023, 2:54 p.m. |
IACR News www.iacr.org
ePrint Report: Faster Amortized FHEW bootstrapping using Ring Automorphisms
Gabrielle De Micheli, Duhyeong Kim, Daniele Micciancio, Adam Suhl
Amortized bootstrapping offers a way to simultaneously refresh many ciphertexts of a fully homomorphic encryption scheme, at a total cost comparable to that of refreshing a single ciphertext. An amortization method for FHEW-style cryptosystems was first proposed by (Micciancio and Sorrell, ICALP 2018), who showed that the amortized cost of bootstrapping n FHEW-style ciphertexts can be reduced from $O(n)$ basic cryptographic operations …
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