Security means
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 26, 1985
Grant Date -
N/A
app pub date -
Nov 13, 1981
filing date -
Feb 15, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A security device having a keyboard with an array of selectively actuable keys which are activated to generate an output code according to a value designated for each of the keys. A series of display units, such as LED's or liquid crystals, display the designated value for each of the keys. Between successive operations of the keyboard, the designated values for each of the keys are randomly scrambled. Each time the keys are actuated, the designated values of the keys are sequentially registered and the sequential values compared to a predetermined access code to determine if the successively actuated values correspond to the predetermined access code.
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