Non-volatile storage within device driver

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I need to store a key which needs to be hidden from everyone else. This needs to be non-volatile storage . One alterative is using files created with zero read, write and modify permissions. Are there other alternatives? And how do I access files(create, read, etc, files with zero permissions) within a device driver? Any sample code for access to files , would be greatly appreciated.
Thanx in advance,
~Rahul
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