Keypad scanning security system

Details Keypad scanning security system Keypad scanning security system

1998-02-09

2000-04-25

Horabik, Michael

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

341 22, 380 52, 379368, H03M 1100

Patent

active

060549408

ABSTRACT:
A secure keypad device incorporating measures to prohibit electronic eavesdropping. Random interrogation of the rows and/or columns of a keypad matrix is employed to determine which key has been pressed. Implementation of the random interrogation process utilizes the mathematical factorial (!) function in conjunction with an algorithm that derives an interrogation sequence. A random number is generated and fed to an algorithm which will derive an interrogation sequence. The sequence is relayed to a keypad scanner which performs the actual interrogation in order to determine which key has been pressed. Further measures are taken to guard against electronic eavesdropping. For instance, the algorithm is designed to take the same amount of time for an unsuccessful key scan as it does for a successful key scan. Also, the time spent on an unpressed scan line is approximately equal to the time required to record a valid key press.

REFERENCES:
patent: 4479112 (1984-10-01), Hirsch
patent: 4926173 (1990-05-01), Frielink
patent: 5025255 (1991-06-01), Mould
patent: 5254989 (1993-10-01), Verrier
patent: 5280283 (1994-01-01), Raasch

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