%0 Journal Article %T An application of the O'Nan-Scott theorem to the group generated by the round functions of an AES-like cipher %A A. Caranti %A F. Dalla Volta %A M. Sala %J Mathematics %D 2008 %I arXiv %X In a previous paper, we had proved that the permutation group generated by the round functions of an AES-like cipher is primitive. Here we apply the O'Nan Scott classification of primitive groups to prove that this group is the alternating group. %U http://arxiv.org/abs/0812.1629v4