Data entry keyboard apparatus

Details Data entry keyboard apparatus Data entry keyboard apparatus

1989-04-03

1990-05-15

Weldon, Ulysses

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

307411, 341 26, 380 52, H03K 1900, H03M 1100

Patent

active

049261738

ABSTRACT:
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).

REFERENCES:
patent: 4479112 (1984-10-01), Hirsch
patent: 4549094 (1985-10-01), Floyd
patent: 4617554 (1986-10-01), Krause et al.

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