Common
Object-capability model
Computer security model
Object-capability model
The object-capability model is a computer security model. A capability describes a transferable right to perform one (or more) operations on a given object. It can be obtained by the following combination: An unforgeable reference (in the sense of object references or protected pointers) that can be sent in messages. A message that specifies the operation to be performed. The security model relies on not being able to forge references. Objects can interact only by sending messages on references. A reference can be obtained by: Initial conditions: In the initial state of the computational world being described, object A may already have a reference to object B. Parenthood: If A creates B, at that moment A obtains the only reference to the newly created B. Endowment: If A creates B, B is born with that subset of A's references with which A chose to endow it. Introduction: If A has references to both B and C, A can send to B a message containing a reference to C. B can retain that reference...
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