Semiconductor device, card, system, and methods of initializing and checking the authenticity and the identity of the semiconductor device
US7525330B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 28, 2002 |
| Grant date | Apr 28, 2009 |
| Priority date | — |
| Expiry date | Jul 30, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S257/922
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The semiconductor device (11) of the invention comprises a circuit covered by a passivation structure (50). It is provided with a first and a second security element (12A, 12B) which comprise local areas of the passivation structure (50), and with a first and a second electrode (14,15). The security elements (12A, 12B) have a first and a second impedance, respectively, which impedances differ. This is realized in that the passivation structure has an effective dielectric constant that varies laterally over the circuit.Actual values of the impedances are measured by measuring means and transferred to an access device by transferring means. The access device comprises or has access to a central database device for storing the impedances. The access device furthermore may compare the actual values with the stored values of the impedances in order to check the authenticity or the identity of the semiconductor device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.