The authsight hack (http://www.zdziarski.com/authsight.tar.gz) , which takes a screenshot after an invalid login, works by tailing the /var/log/asl.log for invalid attempts. Authsight would obviously not work for this purpose and could not be used.
Maybe having a successful login attempt via password, then a check against an image prior to loading the rest of the OS would work. It would login, though an application would prevent use until the image is verified.
MacBook 2GHz Intel Core 2 Duo w/ 2GB DDR2 RAM & 120GB SATA 5400RPM HDD Canon Rebel XTI Google Cr-48 Beta Laptop
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