Value transfer system
US6366894B1 · kind B1 · utility
41Cited by
4References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 23, 1998 |
| Grant date | Apr 2, 2002 |
| Priority date | — |
| Expiry date | Feb 23, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06Q20/3829
- WIPO fieldIT methods for management
- WIPO sectorElectrical engineering
Abstract
A value transfer system using integrated circuit cards for exchanging electronic cash in off-line transactions employs cryptographically secure message protocols. Cards are loaded each with two schemes from a series and interaction between cards determines and uses the oldest scheme shared by the cards, causing one card to switch schemes irrevocably if that common scheme is its second scheme. In this way, a switch to a new scheme can migrate through the system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.