Multilevel security apparatus and method
US4304990A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 4, 1980 |
| Grant date | Dec 8, 1981 |
| Priority date | — |
| Expiry date | Feb 4, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07F7/1008
- WIPO fieldIT methods for management
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.