A Design for a Physical RNG with Robust Entropy Estimators.

Wolfgang Killmann Werner Schindler A Design for a Physical RNG with Robust Entropy Estimators. 146-163 2008 CHES http://dx.doi.org/10.1007/978-3-540-85053-3_10 conf/ches/2008 db/conf/ches/ches2008.html#KillmannS08