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arXiv 1708.09095cs.CCmath.NT
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有限域上大次多项式的恒等式检验与高次幂插值

Identity Testing and Interpolation from High Powers of Polynomials of Large Degree over Finite Fields

Marek Karpinski, Laszlo Mérai, Igor E. Shparlinski

摘要:

我们考虑的问题的身份测试和恢复(即,插值)的“隐藏”monic多项式$f$,给定的Oracle访问$f(x)^e$为$x\in\mathbb F_q$,其中$\mathbb F_q$是有限域的$q$元素和扩展字段访问是不允许的。朴素插值算法需要$de+1$查询,其中$d =\max\{{\rm deg}\ f, {\rm deg }\ g\}$因此需要$ de<q$。对于一个素数$q = p$,我们设计了一个算法,在某些情况下,特别是当$d$是大的渐近更好。该算法是基于一个结果的独立利益在精神的加法组合。它给出了一个上界的一个合理的功能的价值观的数量大的程度,评估一个短序列的连续整数,属于一个小的子群的$\mathbb F_p^*$。

英文摘要:

We consider the problem of identity testing and recovering (that is, interpolating) of a "hidden" monic polynomials $f$, given an oracle access to $f(x)^e$ for $x\in\mathbb F_q$, where $\mathbb F_q$ is the finite field of $q$ elements and an extension fields access is not permitted. The naive interpolation algorithm needs $de+1$ queries, where $d =\max\{{\rm deg}\ f, {\rm deg }\ g\}$ and thus requires $ de<q$. For a prime $q = p$, we design an algorithm that is asymptotically better in certain cases, especially when $d$ is large. The algorithm is based on a result of independent interest in spirit of additive combinatorics. It gives an upper bound on the number of values of a rational function of large degree, evaluated on a short sequence of consecutive integers, that belong to a small subgroup of $\mathbb F_p^*$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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