Proposal and Evaluation of a Method for Secure Division Sum Using the Secret Sharing Scheme by Rounding Off Real Numbers
Yunosuke Noso, Keiichi Iwamura, Masaki Inamura · 2022
Although many secure computations in finite fields are known, few secure computations that can be performed on real numbers have been proposed. Particularly, division of real numbers is difficult for secure computations in a finite field, and there are many inefficient processes (e.g., repeated approximations). In this study, we propose a secure computation method that can directly compute four arithmetic operations, including division, using real numbers. By multiplying the secret information by a random number and rounding off real numbers, the proposed method can evaluate the calculation error in the case of secure computation using real numbers in detail, which has not been done in previous studies. We show that the proposed method has a low error rate and achieves efficient and fast processing, particularly in division.