Stuart G. Stubblebine Paul C. van Oorschot Addressing Online Dictionary Attacks with Login Histories and Humans-in-the-Loop (Extended Abstract). 39-53 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3110&spage=39 2004 conf/fc/2004 Financial Cryptography db/conf/fc/fc2004.html#StubblebineO04