Investigations on c-(almost) perfect nonlinear functions
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In a prior paper <cit.>, two of us, along with P. Ellingsen, P. Felke and A. Tkachenko, 1defined a new (output) multiplicative differential, and the corresponding c-differential uniformity, which has the potential of extending differential cryptanalysis. Here, we continue the work, by looking at some APN functions through the mentioned concept and showing that their c-differential uniformity increases significantly, in some cases.
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