On some block ciphers and imprimitive groups
  The group generated by the round functions of a block ciphers is a widely investigated problem. We identify a large class of block ciphers for which such group is easily guaranteed to be primitive. Our class includes the AES and the SERPENT. 
A. Caranti (Dipartimento di Matematica, Universit\`a degli Studi di   Trento), F.Dalla Volta (Dipartimento di Matematica e A...