| 摘要 |
A system and method for permitting user access to a computer controlled device. A display device displays a group of items to the user. Some of the items are known to the user and some are unknown to the user. An input device receives user input from the user. The user input indicates the presence or absence of the known items within the group of items without specifically identifying which items are known and which items are unknown. A computer is programmed to automatically compare the user input to a predetermined answer. If the user input is correct an access device allows access. In one preferred embodiment the user input includes a count of the number of known items within the group of items. In another preferred embodiment the group of items includes subgroups. The user input includes an identification of which subgroup has the largest number of known items. In another preferred embodiment the group of items is displayed in a grid. The known items are displayed in a pattern within the grid. Multiple comparison patterns are displayed along with the grid. The user input includes an identification of which comparison pattern matches the pattern of the known items within the grid.
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