Secure memory
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United States of America Patent
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-
Jul 22, 2003
Grant Date -
N/A
app pub date -
Jun 18, 1999
filing date -
Jun 18, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A flash memory is secured by disabling write access to the device, thereby preventing unauthorized updating or tampering of the contents. A cryptoengine is included in an integrated circuit (IC) with the flash memory. An attempt to write to the flash memory is successful only if a received encrypted certificate is authenticated by the cryptoengine. If not authenticated, the write enable signal line and the power applied to the flash memory are disabled.
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