Kinds of actors in Authentication and Autho

Explain the several kinds of the actors included in the Authentication and Authorization?

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There exist two kinds of the actors which are required for the authentication and authorization:

a) User or administrator of system who has rights in order to start and stop instances of the system.

b) Elements of the systems which are needed to be present to fully use the requests.

c) The authentication on ubuntu cloud is being carried out by the X509 certificate which comprises of the cryptographic keys for authentication and secures the communications between all actors.

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