Paul C. van Oorschot Stuart G. Stubblebine On countering online dictionary attacks with login histories and humans-in-the-loop. 235-258 2006 9 ACM Trans. Inf. Syst. Secur. 3 http://doi.acm.org/10.1145/1178618.1178619 db/journals/tissec/tissec9.html#OorschotS06