Method for the functioning of a chip card, and chip card in accordance therewith
US5629513A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 3, 1995 |
| Grant date | May 13, 1997 |
| Priority date | — |
| Expiry date | Mar 3, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06Q20/355
- WIPO fieldIT methods for management
- WIPO sectorElectrical engineering
Abstract
The disclosure relates to chip cards and their functioning. When a chip card goes from a first state (A) to a second state (B), functions that were available in the first state are prohibited. To enable the analysis of the malfunctions of the card during a stage of qualification by the testing of an application under real-life experimental conditions, these functions need to be retrieved when a card suffers a malfunction. The invention proposes the placing, in the card, of two state indicators, the first indicator prohibiting the functions that are unnecessary for the step B and the second indicator checking the possibility of making the card return to the step A to retrieve the prohibited functions. The card reader may give the card a command for a return to the state A. This command is verified by the card. If the indicator is in a state that permits the return and if the command is correct, the first indicator is reset in the state corresponding to A. If not, the command is rejected. If the command given is incorrect, the indicator is permanently placed in the state in which it prohibits the return to the State A.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.