On the Walsh Transform of a Class of Functions From Niho Exponents
Nian Li, Tor Helleseth, Alexander Kholosha, Xiaohu Tang · IEEE Transactions on Information Theory · 2013
In this paper, a class of functions from Niho exponents with four-valued Walsh transform is obtained for any prime by a uniform method, and the distribution of the Walsh transform values is also completely determined. In particular, this class of functions is proven to be bent for a special case. Although it is shown that the obtained bent functions are equivalent to the Leander-Kholosha's class of bent functions, a direct and much simpler proof for the bentness of this kind of Niho functions is provided.