Keypad device security system and method

Details Keypad device security system and method Keypad device security system and method

2007-02-20

2007-02-20

Barrón, Jr., Gilberto (Department: 2134)

Information security

Access control or authentication

Stand-alone

C726S026000

Reexamination Certificate

active

09851757

ABSTRACT:
The present invention increases the difficulty of interpreting electromagnetic emissions from a keypad system by facilitating randomness in the electromagnetic emissions associated with a particular key activation. A keypad security circuit utilizes a set of digital values that varies over both time and the bits as a keypad driver word applied to a keypad attribute (e.g., a row or column). The keypad security system of the present invention drives the varying strong keypad driver signal to an attribute of a keypad switch matrix (e.g., the rows or columns), applies an independently configured weak driver signals to the opposing attribute of the keypad switch matrix, retrieves a resulting signal from the opposing attribute, and interprets the results to determine if a switch included in a keypad system was activated (e.g., a key is pressed).

REFERENCES:
patent: 4333090 (1982-06-01), Hirsch
patent: 4926173 (1990-05-01), Frielink
patent: 5677687 (1997-10-01), Valdenaire

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