Multilevel security apparatus and method

Details Multilevel security apparatus and method Multilevel security apparatus and method

1979-12-11

1982-05-04

Pitts, Harold I.

Registers

Systems controlled by data bearing records

Credit or identification card systems

235379, 235381, G06K 700

Patent

active

043284140

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.

REFERENCES:
patent: 3845277 (1974-10-01), Voss et al.
patent: 3862716 (1975-01-01), Black et al.
patent: 3938091 (1976-02-01), Atalla et al.
patent: 4016405 (1977-04-01), McCune et al.
patent: 4198619 (1980-04-01), Atalla

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