Method for detecting the removal of a processing unit from a printed circuit board
US8308819B2 · kind B2 · utility
2Cited by
4References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2006 |
| Grant date | Nov 13, 2012 |
| Priority date | — |
| Expiry date | Aug 22, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07B2017/00411
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Various methods for detecting the removal of a processing unit, such as a microprocessor or a microcontroller, form a printed circuit board in a secure printing system, such as a postage metering system are provided. The methods utilize one or more of a real time clock provided internal to the processing unit, a CMOS device provided on the printed circuit board external to the processing unit, and CMOS memory internal to the processing unit to detect the removal of the processing unit and therefore an attack.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.