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Title:
Practical FHE parameters against lattice attacks
Authors: Jung Hee Cheon, Yongha Son, Donggeon Yhee
Abstract:We give secure parameter suggestions to use sparse secret vectors in LWE based encryption schemes. This should replace existing security parameters, because homomorphic encryption(HE) schemes use quite different variables from the existing parameters. In particular HE schemes using sparse secrets should be supported by experimental analysis, here we summarize existing attacks to be considered and security levels for each attacks. Based on the analysis and experiments, we compute optimal scaling factors for CKKS.
ePrint: https://eprint.iacr.org/2021/039
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