Securing proprietary functions from scan access
US7975307B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 7, 2007 |
| Grant date | Jul 5, 2011 |
| Priority date | — |
| Expiry date | Apr 14, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2221/2105
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An electronic device as described herein implements a scheme to secure a data mapping function from scan access. The protection scheme can be used as a security measure for proprietary lookup tables, secret constants, digitally implemented algorithms, and the like. The electronic device employs a reconfigurable data mapping arrangement that can be reconfigured for a normal operating mode and a scan testing mode. While in the normal operating mode, a normal data mapping arrangement generates valid output data in accordance with the data mapping function. While in the scanning mode, however, a scanning data mapping arrangement generates invalid but testable output data in accordance with a data masking function that conceals, hides, masks, or obfuscates the data mapping function. Using the data masking function in this manner protects the data mapping function against reverse engineering attacks that attempt to derive the data mapping function from scan testing results.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.