Multilevel security apparatus and method
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United States of America Patent
Stats
-
Dec 8, 1981
Issued Date -
N/A
app pub date -
Feb 4, 1980
filing date -
Dec 11, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A card-coding system and method preserves the security of the encoding process against duplication and counterfeiting of cards by securing the interactions under the control of the individual and then of the issuing institution. Multilevels of offset codes are generated in successive interactions so that attempted alteration, duplication, or counterfeiting of a coded card will be readily detectable using 'off-line' card-checking apparatus. An 'active' card is initially issued or authorized with an established credit balance, and its authenticity, balance, and proper use are continuously checked, debited and updated in each authorized transaction completed by the proper individual.
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