Multilevel security apparatus and method

Details Multilevel security apparatus and method Multilevel security apparatus and method

1980-02-04

1981-12-08

Pitts, Harold I.

Registers

Systems controlled by data bearing records

Credit or identification card systems

235379, 235381, G06K 701

Patent

active

043049907

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.

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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