Security: Gateway Security Model Design
The Gateway Security Model is based on the Capabilities model.
Permit is the requested object
Gate is an authentication method
Role is a signature
Ticket is a use-once token of the capabilities

The Capabilities model, originally defined by Dennis and Van Horm in 1966 provides the model necessary to implement limited trust relationships. The object-oriented definition of Capability is an interface which restricts the use of an object to its intended purpose. Possession of the capability confers the right to use it.

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