Security device for a semiconductor chip
US5881155A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 31, 1997 |
| Grant date | Mar 9, 1999 |
| Priority date | — |
| Expiry date | Mar 31, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/01019
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Security device for preventing access to confidential information stored in a semiconductor chip, or protected chip. The security device comprises a second semiconductor chip, or protective chip, with the two chips facing each other and being coupled to each other by communication terminals. The protected chip is coupled to external circuits via the protective chip, and the two semiconductor chips are separated by a semiconductor resin having a non-homogeneous electrical resistivity. The protective chip is provided with means for measuring a plurality of resistances through the semiconductor resin and with means for determining, at least from the measured resistances, an encryption key intended to be communicated to the protect chip to protect the confidential information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.