Device and method for securing software
US8397081B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 22, 2005 |
| Grant date | Mar 12, 2013 |
| Priority date | — |
| Expiry date | Sep 14, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F21/72
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A device includes a first memory unit adapted to store encrypted instructions, a processor adapted to execute decrypted instructions, a second memory unit accessible by the processor, and a decryption unit. The device includes a key database and a key selection circuit, wherein the key selection circuit is adapted to select a selected decryption key from the key database for decrypting encrypted instructions. The selection is responsive to a fixed selection information stored within the integrated circuit and to received key selection information. A method includes a stage of receiving encrypted instructions; and executing decrypted instructions by a processor. The method includes receiving key selection information, selecting a selected decryption key out of a key database in response to fixed selection information and to the received key selection information, and decrypting encrypted instructions using the selected decryption key.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.