Investigations on <i>c</i>-(Almost) Perfect Nonlinear Functions

In a prior paper (Ellingsen et al. , 2020), two of us, along with P. Ellingsen, Felke, and A. Tkachenko, defined new (output) multiplicative differential the corresponding $c$ -differential uniformity, which has potential extending cryptanalysis. Here, we continue work by looking at some APN functions through mentioned concept showing that their uniformity increases significantly in cases.