Markoff covers Felten.
The technique, which could undermine security software protecting critical data on computers, is as easy as chilling a computer memory chip with a blast of frigid air from a can of dust remover.
Officials at the Department of Homeland Security, which paid for a portion of the research, did not return repeated calls for comment.
A federal magistrate ruled recently that forcing the suspect to disclose a password would be unconstitutional.
