Data entry keyboard apparatus

Details Data entry keyboard apparatus Data entry keyboard apparatus

H - Electricity

03

M

340/175

H03M 11/00 (2006.01)

Patent

CA 1293039

62118-1875 DATA ENTRY KEYBOARD APPARATUS Abstract of the Disclosure A data entry keyboard apparatus includes a key switch array (18) in a keyboard unit (12) connected via a cable (14) to a tamper-resistant module (28) which contains control circuitry (16). The control circuitry (16) includes a random pattern generator (30) which generates successive random patterns, causing the selection of a single column and a random pattern of rows, thereby effecting the simulation of key actuations. An EXCLUSIVE-OR gating network (56a-56d) is effective to distinguish a genuine key actuation from simulated key actuations. The invention prevents the ascertainment of actuated keys by unauthorized tapping connections applied to the keyboard unit (12) or the cable (14).

609645

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