Access-protected data carrier
US7602916B1 · kind B1 · utility
1Cited by
2References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 7, 1999 |
| Grant date | Oct 13, 2009 |
| Priority date | — |
| Expiry date | Sep 7, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/08
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The invention relates to a data carrier having a semiconductor chip (5) with at least one memory. The memory contains an operating program that is able to perform at least one operation (h). In order to prevent unauthorized access to the data (x) processed with the operation (h), both said data and the operation (h) itself are disguised. The disguising of the data (x) and the operation (h) is coordinated such that the disguised operation (hR1R, hR1R2) generates either the output data (y) of the undisguised operation (h) or disguised output data (y{circle around (x)}R2) from which the output data (y) can be determined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.