## CryptoDB

### Paper: On The Inequivalence Of Ness-Helleseth APN Functions

Authors: Xiangyong Zeng Lei Hu Yang Yang Wenfeng Jiang URL: http://eprint.iacr.org/2007/379 Search ePrint Search Google In this paper, the Ness-Helleseth functions over $F_{p^n}$ defined by the form $f(x)=ux^{\frac{p^n-1}{2}-1}+x^{p^n-2}$ are proven to be a new class of almost perfect nonlinear (APN) functions and they are CCZ-inequivalent with all other known APN functions when $p\geq 7$. The original method of Ness and Helleseth showing the functions are APN for $p=3$ and odd $n\geq 3$ is also suitable for showing their APN property for any prime $p\geq 7$ with $p\equiv 3\,({\rm mod}\,4)$ and odd $n$.
##### BibTeX
@misc{eprint-2007-13659,
title={On The Inequivalence Of Ness-Helleseth APN Functions},
booktitle={IACR Eprint archive},
keywords={secret-key cryptography /Almost perfect nonlinear (APN) function, Ness-Helleseth function, CCZ-equivalence},
url={http://eprint.iacr.org/2007/379},
note={Almost perfect nonlinear (APN), differential uniformity, EA-equivalence, CCZ-equivalence xzeng@hubu.edu.cn 13830 received 25 Sep 2007, last revised 13 Nov 2007},
author={Xiangyong Zeng and Lei Hu and Yang Yang and Wenfeng Jiang},
year=2007
}