Method for checking whether program instructions have been executed by a portable end device
US9058484B2 · kind B2 · utility
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15Claims
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Key dates
| Filing date | May 6, 2011 |
| Grant date | Jun 16, 2015 |
| Priority date | — |
| Expiry date | Jan 31, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2221/2123
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and a system for checking whether program instructions have been executed by an end device, wherein, the end device calls for program instructions and the program instructions are stored in executable form in a trustworthy entity, in particular a chip card. Subsequently, the program instructions are variably modified in the trustworthy entity such that the modified program instructions vary upon each execution of the method. Through execution of the instructions in the end device there is obtained a check value which is in turn transferred to the trustworthy entity and verified in the trustworthy entity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.