A computer security model is a scheme for specifying and enforcing security policies. A security model may be founded upon computer security and control pdf formal model of access rights, a model of computation, a model of distributed computing, or no particular theoretical grounding at all. A computer security model is implemented through a computer security policy. For a more complete list of available articles on specific security models, see Category:Computer security models.
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Authentication methods and tokens include passwords, biometric scans, physical keys, electronic keys and devices, hidden paths, social barriers, and monitoring by humans and automated systems. Different ACL systems have a variety of different conventions regarding who or what is responsible for editing the list and how it is edited. Authorization involves the act of defining access-rights for subjects.
An authorization policy specifies the operations that subjects are allowed to execute within a system. If the file is a program, the subject can cause the program to be run. In Unix-style systems, the “execute” permission doubles as a “traverse directory” permission when granted for a directory. A process assumes that there was an initial validation of the identity, commonly called identity proofing.