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Paper 2021/039

Practical FHE parameters against lattice attacks

Jung Hee Cheon and Yongha Son and 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.

Metadata
Available format(s)
PDF
Category
Public-key cryptography
Publication info
Preprint. MINOR revision.
Keywords
fully homomorphic encryptionsparse secretshybrid attacks
Contact author(s)
dgyhee @ gmail com
History
2021-01-27: revised
2021-01-12: received
See all versions
Short URL
https://ia.cr/2021/039
License
Creative Commons Attribution
CC BY
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