Identity verification system resistant to compromise by...

G - Physics – 07 – F

Patent

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G07F 7/08 (2006.01) G07C 9/00 (2006.01) G07F 7/10 (2006.01)

Patent

CA 2089306

A mechanism for an automated system to allow a user of the system to demonstrate his legitimacy by demonstration of secret knowledge. The mechanism is resistant to compromise by observation of its use. An array of symbols is presented to the user and the user is required to manipulate several symbols at once until assigned key symbols are manipulated into predetermined states. Doing so effectively prevents an observer from determining which symbols are the ones of interest. For example, pushing a button might cause several symbols in the array to exchange their positions. The user continues to do this, having, perhaps, to use several different buttons, until a certain subset of the symbols appears in certain locations within the array. (In this example, the arrangement of this subset of symbols is the user's password or PIN.) In this process many symbols in the array, in addition to the user's specific symbols, would also have been moved, making it virtually impossible for an observer to identify which symbols and array-positions are pertinent to the user's password or PIN.

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