Transaction device with noise signal encryption

Details Transaction device with noise signal encryption Transaction device with noise signal encryption

2008-06-24

2008-06-24

Revak, Christopher (Department: 2131)

Electrical computers and digital processing systems: support

System access control based on user identification by...

Pin/password generator device

C713S189000, C380S044000

Reexamination Certificate

active

07392396

ABSTRACT:
A transaction device adds or injects a random noise component into signals representing (x,y) coordinate signals associated with user interface with an input screen associated with the device. The noise component can be generated by converting to analog the output of a random number generator, and then adding the noise component to the x-axis and/or y-axis component of the (x,y) coordinate signal. Alternatively the noise component can be injected into the x-axis and/or y-axis operating potential for the input screen. The result is a masking of the original (x,y) positional information. The randomly generated number is only available internal to the device. The device can use this number to de-crypt the true (x,y) signals, which signals can then be re-encrypted before transmitting from the device.

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www.hypercom.com

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