Authors: Hans Dobbertin Gregor Leander
Publish Date: 2008/04/08
Volume: 49, Issue: 1-3, Pages: 3-22
Abstract
Suppose that n is even Let mathbbF 2 denote the twoelement field and mathbbZ the set of integers Bent functions can be defined as ± 1valued functions on mathbbF 2n with ± 1valued Fourier transform More generally we call a mapping f on mathbbF 2n a mathbbZ bent function if both f and its Fourier transform widehatf are integervalued mathbbZ bent functions f are separated into different levels depending on the size of the maximal absolute value attained by f and widehatf It is shown how mathbbZ bent functions of lower level can be built up recursively by gluing together mathbbZ bent functions of higher level This recursion comes down at level zero containing the usual bent functions In the present paper we start to study bent functions in the framework of mathbbZ bent functions and give some guidelines for further research
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