Tetsu Iwata Tomonobu Yoshino Kaoru Kurosawa Non-cryptographic primitive for pseudorandom permutation. 139-154 2003 306 Theor. Comput. Sci. 1-3 http://dx.doi.org/10.1016/S0304-3975(03)00245-7 db/journals/tcs/tcs306.html#IwataYK03