Patent 8392975 was granted and assigned to Google on March, 2013 by the United States Patent and Trademark Office.
Some embodiments provide a system that authenticates a user. During operation, the system obtains an identifier for the user from an identification card associated with the user and displays a set of images to the user. Next, the system receives an image sequence comprising a sequence of images selected by the user from the set of images. Finally, the system authenticates the user based on the identifier and the image sequence.