System for encryption and identification
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United States of America Patent
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-
Nov 3, 1992
Issued Date -
N/A
app pub date -
Oct 5, 1990
filing date -
Sep 10, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A delay means in a security apparatus for identifying a code of characters to authenticate access to the apparatus by matching an entered code with a stored value by a procedure which so enciphers the coded information as it is entered into the apparatus and displayed on a keyboard that disclosure of the code by observation of the entry operation is prevented. A delay timing circuit produces a delayed signal in the matching of the entered code and the stored value so that the length of the period of time for authentication is controllable.
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