Multilevel security apparatus and method
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United States of America Patent
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-
May 4, 1982
Grant Date -
N/A
app pub date -
Dec 11, 1979
filing date -
Dec 11, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A card-encoding 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.
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