Tamper proof security measure in data writing to non-volatile memory
US5715431A · kind A · utility
40Cited by
7References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 3, 1995 |
| Grant date | Feb 3, 1998 |
| Priority date | — |
| Expiry date | Feb 3, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C16/105
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method of writing data to non-volatile memory such as electrically erasable programmable read only memory (EEPROM) in a smart card provides a write status region of EEPROM which is examined on each reset of the card. If the preceding write operation was unsuccessful, perhaps because of deliberate manipulation of the card, a recovery procedure is implemented. If recovery is successful, the card operation can be run. Otherwise the card is unusable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.