Publications
Detailed Information
Bootstrapping for approximate homomorphic encryption
Cited 124 time in
Web of Science
Cited 140 time in Scopus
- Authors
- Issue Date
- 2018-05
- Publisher
- Springer Verlag
- Citation
- Lecture Notes in Computer Science, Vol.10820, pp.360-384
- Abstract
- © International Association for Cryptologic Research 2018.This paper extends the leveled homomorphic encryption scheme for an approximate arithmetic of Cheon et al. (ASIACRYPT 2017) to a fully homomorphic encryption, i.e.,we propose a new technique to refresh low-level ciphertexts based on Gentrys bootstrapping procedure. The modular reduction operation is the main bottleneck in the homomorphic evaluation of the decryption circuit. We exploit a scaled sine function as an approximation of the modular reduction operation and present an efficient evaluation strategy. Our method requires only one homomorphic multiplication for each of iterations and so the total computation cost grows linearly with the depth of the decryption circuit. We also show how to recrypt packed ciphertexts on the RLWE construction with an open-source implementation. For example, it takes 139.8s to refresh a ciphertext that encrypts 128numbers with 12bits of precision, yielding an amortized rate of 1.1seconds per slot.
- ISSN
- 0302-9743
- Files in This Item:
- There are no files associated with this item.
- Appears in Collections:
Item View & Download Count
Items in S-Space are protected by copyright, with all rights reserved, unless otherwise indicated.