Polynomial Interpolation and Identity Testing from High Powers Over Finite Fields
Ivanyos, Gábor and Karpinski, M and Santha, M and Saxena, N and Shparlinski, IE (2018) Polynomial Interpolation and Identity Testing from High Powers Over Finite Fields. ALGORITHMICA, 80 (2). pp. 560575. ISSN 01784617 10.1007/s0045301602731

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Abstract
We consider the problem of recovering (that is, interpolating) and identity testing of a “hidden” monic polynomial f, given an oracle access to (Formula presented.) for (Formula presented.), where (Formula presented.) is finite field of q elements (extension fields access is not permitted). The naive interpolation algorithm needs (Formula presented.) queries and thus requires (Formula presented.). We design algorithms that are asymptotically better in certain cases; requiring only (Formula presented.) queries to the oracle. In the randomized (and quantum) setting, we give a substantially better interpolation algorithm, that requires only (Formula presented.) queries. Such results have been known before only for the special case of a linear f, called the hidden shifted power problem. We use techniques from algebra, such as effective versions of Hilbert’s Nullstellensatz, and analytic number theory, such as results on the distribution of rational functions in subgroups and character sum estimates. © 2017 Springer Science+Business Media New York
Item Type:  Article 

Uncontrolled Keywords:  interpolation; Quantum Theory; Number theory; Polynomials; Deterministic algorithms; Rational Function; rational functions; quantum algorithms; Quantum algorithm; Black boxes; Randomised algorithms; Randomised algorithm; Nullstellensatz; Hidden polynomial power; Deterministic algorithm; Blackbox interpolation; 
Subjects:  Q Science > QA Mathematics and Computer Science > QA75 Electronic computers. Computer science / számítástechnika, számítógéptudomány 
Divisions:  Informatics Laboratory 
SWORD Depositor:  MTMT Injector 
Depositing User:  MTMT Injector 
Date Deposited:  08 Jan 2019 10:09 
Last Modified:  21 Jul 2019 13:34 
URI:  http://eprints.sztaki.hu/id/eprint/9543 
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