Method and system for writing information in a data carrier making it possible to later certify the originality of this information
US5796835A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 7, 1997 |
| Grant date | Aug 18, 1998 |
| Priority date | — |
| Expiry date | May 7, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07F7/082
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The invention consists of writing at least one piece of information I! and an image I'! thereof into the accessible memory zone Ac of a portable object (1). This image I'! is obtained by implementing a program of encipherment of the information I!. This program takes into account at least the one piece of information I!, a first datum Ks! that is external to the portable object and furnished to encipherment circuits (21) under the control of the person writing the information, and a second datum Sid! that is diversified for each portable object (1). Later certification consists of verifying that an image I'! has been obtained with the aid of the first and second data, so as to deduce from this that the associated information I! is original.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.