Computer Science ›› 2019, Vol. 46 ›› Issue (5): 298-303.

### Divide-and-Conquer Algorithm for Sparse Polynomial Interpolation

DENG Guo-qiang, TANG Min, LIANG Zhuang-chang

1. (Guangxi Key Laboratory of Cryptography and Information Security,Guilin University of Electrical Technology,Guilin,Guangxi 541004,China)
• Published:2019-05-15

Abstract: Sparse interpolation is widely used in quite different applications and areas of science and engineering.Its goal is to recover the goal polynomial by taking advantage of the sparse structure of the polynomial and given discrete va-lues.For polynomials with the large size,the current methods show high time complexity,because the size and the number of algebra operations are related to the number of terms and the total degree of the goal polynomials.For this reason,this paper presented a divide-and-conquer algorithm for sparse polynomial interpolation over finite fields.The basic strategy is to choose one of variables as the main variable and the coefficients are multivariate polynomials in other variables.In this way,the original polynomial interpolation is divided into a list of univariate polynomial interpolations and a list of sub-polynomials with smaller size.The solution of the original problem is to merge these sub-polynomials.To implement the divide-and-conquer strategy for the sparse polynomial interpolation,this paper designed four sub-algorithms:univariate polynomial interpolation based on early termination strategy,univariate polynomial interpolation with a prior knowledge of the total degrees of the polynomial,the determination of the number of terms of the polynomial via Hankle matrix determinant,and Ben-Or/Tiwari’s algorithm with an upper bound of the number of terms.In numerical experiments,the performance of the new algorithm is compared with that of Zippel’s algorithm,Ben-Or/Tiwari’s algorithm and Javadi/Monagan’s algorithm.Extensive experiments show that the new algorithm is much faster than other three algorithms.The experimental data demonstrate that the use of divide-and-conquer and early termination strategy not only eliminates some priori knowledge of the total degree and the number of terms of the goal polynomials,but also decomposes a large number of higher order algebra operations into smaller ones.Therefore,the bottleneck of the large-scale multivariate polynomial interpolation problems is effectively solved.

CLC Number:

• TP301.6
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 [1] ZHANG Meng HE Kai-cheng HAN Wen-bao ZENG Guang （Department of Information Research, Information Engineering University, Zhengzhou 450002, China）. [J]. Computer Science, 2008, 35(12): 119-121.
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