Electrical computers and digital processing systems: support – Data processing protection using cryptography – By stored data protection
Reexamination Certificate
2011-01-04
2011-01-04
Smithers, Matthew B (Department: 2437)
Electrical computers and digital processing systems: support
Data processing protection using cryptography
By stored data protection
C726S033000
Reexamination Certificate
active
07865739
ABSTRACT:
Methods and devices for transferring data from a non-volatile memory to a working memory of an electronic data processing device are provided. Security data is copied from the non-volatile memory to the working memory. The security data is to be write-protected. A blocking function is activated for the security data in the working memory. The activation is triggered by the copying being made to the working memory. All communication with the working memory is monitored. All write attempts to the copied security data stored in the working memory are blocked according to the blocking function. At least activating a blocking function, monitoring communication and blocking write attempts are performed independently of a central processing unit of the electronic data processing device, such that the central processing unit cannot manipulate the security data.
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Myers Bigel & Sibley & Sajovec
Sholeman Abu
Smithers Matthew B
Sony Ericsson Mobile Communications AB
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