Johan Håstad Russell Impagliazzo Leonid A. Levin Michael Luby A Pseudorandom Generator from any One-way Function. 1364-1396 1999 28 SIAM J. Comput. 4 db/journals/siamcomp/siamcomp28.html#HastadILL99 http://dx.doi.org/10.1137/S0097539793244708