One way the physical keys and digital keys are exactly alike is that you cannot use them unless you actually possess the key. The obviousness of this statement for physical keys is matched by the lack of obviousness of the statement for digital keys. This stark difference in awareness is due in part to the fact that while we all understand what having a physical key means, it is not so clear what "having" a digital key means in practice.
Key Management for Physical Access Control Tam Hulusi Security Technology Executive; May/Jun 2010; Docstoc pg. S18 Reproduce
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