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A capability is a set of access rights granted to a subject, often transferable. Capabilities are a method for access control.

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What is the practical difference between MAC and Capabilities

In fact, NICTA advertises that as a result of the seL4 security proof, it became clear that capabilities are essential and they also ported them to the current OKL4. … Without capabilities, you need a global namespace so that the Reference Monitor(OS, microkernel) is able to lookup each and every application in the MAC table. …
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