System for cryptographing and identification
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 9, 1990
Grant Date -
N/A
app pub date -
Sep 10, 1987
filing date -
Sep 10, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
According to the invention, the keyboard consists of a matrix of keys and variable visible indicia. Each of the variable visible indicia is associated with a key. Upon each keystroke on the keyboard, the system randomly changes the positions of all of the indicia on the matrix. Because the true value of any particular key is independent of the value displayed on the variable visible indicia, a casual observer can not learn the keystrokes being entered into the keyboard. If the code entered at the keyboard matches a stored value, the user is granted access.
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