Bent function is a class of the highest nonlinear Boolean functions.In this paper three methods of design and construction are discussed with examples,which are algebra method,the character function in projective geometry and random researching method.Also,the Bent function of PS class is implemented with C language.At last,the concatenate construction from m=2n-λ Bent functions of k variables to a Bent function of n variables is given and verified with Walsh spectra.
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