http://research.microsoft.com/research/pubs/view.aspx?type=Technical%20Report&id=790&0sr=p

MSR-TR-2004-85
Inkblot Authentication
Adam Stubblefield; Dan Simon
August 2004
0 p.
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In this paper we present a system that helps users select, remember, and
differentiate strong passwords. Similar in nature to a Rorchach inkblot
test, the system asks the user to form semantic associations with a set of
randomly generated inkblot-like images. These image associations can then be
used to authenticate the user. This approach is based on evidence from the
psychological literature that suggests users will both choose dissimilar
associations and retain their associations for long periods of time. We
report on two user studies which show that inkblot based passwords are both
memorable and high in entropy.

Keywords: Authentication