Device authentication system for on and off line use
US4795890A · kind A · utility
122Cited by
5References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 2, 1987 |
| Grant date | Jan 3, 1989 |
| Priority date | — |
| Expiry date | Feb 2, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07F7/127
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A verification system for cards or other devices with an anticounterfeit characteristic and an escort memory, wherein for lower or routine levels of security, the escort memory serves to confirm part of the anticounterfeit characteristic and for higher levels of security a central station memory is employed to confirm another part of the anticounterfeit characteristic. Distinction between levels of security is determined on the basis of time or other criteria imposed from the central station.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.