Device authentication system for on and off line use
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jan 3, 1989
Grant Date -
N/A
app pub date -
Feb 2, 1987
filing date -
Feb 2, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A verification system for cards or other devices with an anticounterfeit characteristic and an escort memory, wherein for lower or routine levels of security, the escort memory serves to confirm part of the anticounterfeit characteristic and for higher levels of security a central station memory is employed to confirm another part of the anticounterfeit characteristic. Distinction between levels of security is determined on the basis of time or other criteria imposed from the central station.
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