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Towards round-optimal secure multiparty computations: Multikey FHE without a CRS

Title
Towards round-optimal secure multiparty computations: Multikey FHE without a CRS
Authors
Kim E.Lee H.-S.Park J.
Ewha Authors
이향숙
SCOPUS Author ID
이향숙scopus
Issue Date
2018
Journal Title
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
ISSN
0302-9743JCR Link
Citation
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) vol. 10946 LNCS, pp. 101 - 113
Publisher
Springer Verlag
Indexed
SCOPUS scopus
Document Type
Conference Paper
Abstract
Multikey fully homomorphic encryption (MFHE) allows homomorphic operations between ciphertexts encrypted under different keys. In applications for secure multiparty computation (MPC) protocols, MFHE can be more advantageous than usual fully homomorphic encryption (FHE) since users do not need to agree with a common public key before the computation when using MFHE. In EUROCRYPT 2016, Mukherjee and Wichs constructed a secure MPC protocol in only two rounds via MFHE which deals with a common random/reference string (CRS) in key generation. After then, Brakerski et al. replaced the role of CRS with the distributed setup for CRS calculation to form a four round secure MPC protocol. Thus, recent improvements in round complexity of MPC protocols have been made using MFHE. In this paper, we go further to obtain round-efficient and secure MPC protocols. The underlying MFHE schemes in previous works still involve the common value, CRS, it seems to weaken the power of using MFHE to allow users to independently generate their own keys. Therefore, we resolve the issue by constructing an MFHE scheme without CRS based on LWE assumption, and then we obtain a secure MPC protocol against semi-malicious security in three rounds. © Springer International Publishing AG, part of Springer Nature 2018.
DOI
10.1007/978-3-319-93638-3_7
ISBN
9783319936376
Appears in Collections:
자연과학대학 > 수학전공 > Journal papers
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