Data carrier device with test means for testing the access authorization of a data reading device
US6276604A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 11, 1999 |
| Grant date | Aug 21, 2001 |
| Priority date | — |
| Expiry date | Aug 11, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07F7/1083
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A data carrier device for outputting data stored in the data carrier device to at least one data reading device is provided with a data storage device for storing data and a fail count storage device for storing a fail count, a password information storage device for storing at least one password information item, and a test device for testing whether password information output to the data carrier device by a data reading device matches password information stored in the password information storage device, and for changing a fail count, stored in the fail count storage device in dependence on the test result. There is provided a random number generator for selecting a random number from a random number range, and the test device being arranged to fix, in case the tested password information does not match, a selected random number as the fail count.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.