Secure keyboard with random order of key interrogation

Details Secure keyboard with random order of key interrogation Secure keyboard with random order of key interrogation

1989-09-14

1991-06-18

DeMeo, Palmer C.

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

341 22, 380 52, H03K 1794, H03M 1120

Patent

active

050252550

ABSTRACT:
A keyboard arrangement, such as for a computer or the like, has a number of keys arranged in rows and columns. The keys of each row are associated with a respective conductor and the keys of each column are associated with a respective conductor. Each key, when depressed, interconnects the two conductors. An interrogator is provided to interrogate the rows respectively by transmitting pulses to the rows and to interrogate the columns, to determine the presence of a transmitted pulse. The interrogator is adapted to interrogate the rows in a random or quasi-random order during successive cycles of operation.

REFERENCES:
patent: 4479112 (1984-10-01), Hirsch
patent: 4926173 (1990-05-01), Frielink

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