Method and apparatus for increasing security against unauthorized write access to a protected memory
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United States of America Patent
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Jun 19, 2001
Grant Date -
N/A
app pub date -
Jan 5, 1998
filing date -
Feb 9, 1996
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A system and method for protecting a non-volatile storage element of an electronic system from an unauthorized write access is described. The method features the operational steps of entering a mode of operation in which an authentication process is performed, placing a security circuit of the electronic system in a first predetermined state of operation before leaving the mode of operation, checking the current state of the security circuit, and halting further operations of the electronic system if the security circuit exists in a state of operation other than the first predetermined state of operation.
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