Presentation 2021-05-19
[Invited Talk] Efficiency and Accuracy Improvements of Secure Floating-Point Addition over Secret Sharing (from IWSEC 2020)
Kota Sasaki, Koji Nuida,
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Abstract(in Japanese) (See Japanese page)
Abstract(in English) In secure multiparty computation (MPC), floating-point numbers should be handled in many potential applications, but these are basically expensive. In particular, for MPC based on secret sharing (SS), the floating-point addition takes many communication rounds though the addition is the most fundamental operation. In this paper, we propose an SS-based two-party protocol for floating-point addition with 13 rounds (for single/double precision numbers), which is much fewer than the milestone work of Aliasgari et al. in NDSS 2013 (34 and 36 rounds, respectively) and also fewer than the state of the art in the literature. Moreover, in contrast to the existing SS-based protocols which are all based on “roundTowardZero” rounding mode in the IEEE 754 standard, we propose another protocol with 15 rounds which is the first result realizing more accurate “roundTiesToEven” rounding mode. We also discuss possible applications of the latter protocol to secure Validated Numerics (a.k.a. Rigorous Computation) by implementing a simple example.
Keyword(in Japanese) (See Japanese page)
Keyword(in English) secure multiparty computation / floating-point numbers / secret sharing
Paper # ISEC2021-8
Date of Issue 2021-05-12 (ISEC)

Conference Information
Committee ISEC
Conference Date 2021/5/19(1days)
Place (in Japanese) (See Japanese page)
Place (in English) Online
Topics (in Japanese) (See Japanese page)
Topics (in English)
Chair Shoichi Hirose(Univ. of Fukui)
Vice Chair Tetsuya Izu(Fujitsu Labs.) / Noboru Kunihiro(Tsukuba Univ.)
Secretary Tetsuya Izu(Tsukuba Univ.) / Noboru Kunihiro(Fujitsu Labs.)
Assistant Kazuki Yoneyama(Ibaraki Univ.)

Paper Information
Registration To Technical Committee on Information Security
Language JPN
Title (in Japanese) (See Japanese page)
Sub Title (in Japanese) (See Japanese page)
Title (in English) [Invited Talk] Efficiency and Accuracy Improvements of Secure Floating-Point Addition over Secret Sharing (from IWSEC 2020)
Sub Title (in English)
Keyword(1) secure multiparty computation
Keyword(2) floating-point numbers
Keyword(3) secret sharing
1st Author's Name Kota Sasaki
1st Author's Affiliation The University of Tokyo(The Univ. of Tokyo)
2nd Author's Name Koji Nuida
2nd Author's Affiliation Kyushu University(Kyushu Univ.)
Date 2021-05-19
Paper # ISEC2021-8
Volume (vol) vol.121
Number (no) ISEC-22
Page pp.pp.33-33(ISEC),
#Pages 1
Date of Issue 2021-05-12 (ISEC)