A new almost perfect nonlinear function which is not quadratic

@article{Edel2009ANA,
  title={A new almost perfect nonlinear function which is not quadratic},
  author={Yves Edel and Alexander Pott},
  journal={Adv. Math. Commun.},
  year={2009},
  volume={3},
  pages={59-81}
}
Following an example in [12], we show how to change one coordinate function of an almost perfect nonlinear (APN) function in order to obtain new examples. It turns out that this is a very powerful method to construct new APN functions. In particular, we show that our approach can be used to construct a ''non-quadratic'' APN function. This new example is in remarkable contrast to all recently constructed functions which have all been quadratic. An equivalent function has been found… 

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