Method for secure storage of sensitive data in a memory of an embedded microchip system, particularly a smart card, and embedded system implementing the method
US7260727B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 2001 |
| Grant date | Aug 21, 2007 |
| Priority date | — |
| Expiry date | Apr 7, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07F7/082
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The invention concerns a method for secure storage of a piece of so-called sensitive data, for example an encryption key, in a memory (M) of an embedded microchip system, particularly a smart card (CP). The memory (M) comprises two physically distinct storage devices (1, 2), for example a permanent memory of the “ROM” type (1), and a second, re-programmable memory of the “EEPROM” type (2). The piece of sensitive data is divided into at least two parts (d, d′), in a given logical configuration, each of these parts being stored in one of the distinct storage devices (1, 2). An additional piece of verification data, a checksum or hash data, can also be stored in the first storage device (1), at the same time as the first sensitive data part (d).The invention also concerns an embedded microchip system, particularly a smart card (CP).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.