Multilevel security apparatus and method
US4328414A · kind A · utility
56Cited by
5References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 11, 1979 |
| Grant date | May 4, 1982 |
| Priority date | — |
| Expiry date | Dec 11, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06Q20/3672
- WIPO fieldIT methods for management
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.