Secure mode controlled memory
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United States of America Patent
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Mar 3, 2009
Grant Date -
Sep 22, 2005
app pub date -
Mar 19, 2004
filing date -
Mar 19, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention relates to a method of, and a system for, enhancing data security, which data is to be executed in an electronic device (101) comprising a secure execution environment (104) to which access is restricted. A basic idea of the present invention is that, at device boot, data in the form of e.g. program code is copied from permanent memory (112) to temporary memory (110). The integrity of this program code must be verified to ensure that the program code has not been altered during the transmission between the memories. Further, a new secret key is generated in the secure execution environment. This new secret key is used by a device processor (103) to encrypt the program code to be stored in the temporary memory in order to ensure that the program code is kept secret during transmission. The device processor thereafter writes the encrypted program code into the temporary memory.
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