Time-accounting system and method comprising means for the generation of codes at instants computed by a secret algorithm
US5235565A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 1991 |
| Grant date | Aug 10, 1993 |
| Priority date | — |
| Expiry date | Dec 10, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07F17/24
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A device that can be used to check the authenticity of time-accounting systems and devices, and notably of time-accounting devices for reckoning periods of parking regulated by rules. The system is constituted by a plurality of boxes, each held by a distinct user, each box comprising computation means that determine at least two secret codes, the changing from one secret code to another being done substantially at one and the same instant for all of boxes and secret codes being identical for all of boxes substantially at the same instant to enable a checker to ascertain the authenticity of boxes, code-changing instant resulting from a secret computation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.