Method and apparatus employing a dynamic encryption interface between a processor and a memory
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United States of America Patent
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Nov 16, 1999
Grant Date -
N/A
app pub date -
Sep 29, 1997
filing date -
Sep 29, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
A method and apparatus employing a dynamic encryption interface between a processor and a memory. The interface of the present invention dynamically encrypts the contents of the memory. A determination is made whether a memory access request is active. If yes, a further determination is made whether the address associated with the memory access request is greater than a POINTER. If yes, encrypting or decrypting the memory access using a first key. If no, encrypting or decrypting the memory access using a second key. Processing then proceeds to the decision block that determines whether or not the memory access request is active. If the memory access request is not active, data is read from a memory location identified by the POINTER. The read data is decrypted using the first key. The data is encrypted using the second key. The encrypted data is written back to the memory location point identified by the POINTER.
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