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Direct vs. Random Access

Would someone please clarify for me the difference between direct and random access? Specifically, why does this Wikipedia article on Direct Access Storage Devices distinguish between the two: ...
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1answer
325 views

Can the Bell-LaPadula model emulate the Chinese Wall model?

I have been reading on security policies and the question wether Bell-LaPadula can be used to implement Chinese Wall. Does anyone know more about it?
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1answer
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Where can I find good study material on Role Mining?

I need to cover these topics in Role Mining. If anyone knows good site which well summarizes the topics and concepts are well explained please help out. Basic role mining problem • Delta-approx RMP • ...
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Fine-grained security models for XML data

Access control models are typically very coarse-grained, allowing one access to a resource (possibly with some combination of read/write/execute permission) or exclude such access. Some models of ...