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A security model may be founded upon a 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 ...
According to the model, the protection state of a computer system can be abstracted as a set of objects , that is the set of entities that needs to be protected (e.g. processes, files, memory pages) and a set of subjects , that consists of all active entities (e.g. users, processes).
A simple definition of a security policy is "to set who may use what information in a computer system". [1] The access matrix model, first introduced in 1971, [2] is a generalized description of operating system protection mechanisms. [3] The separation of protection and security is a special case of the separation of mechanism and policy. [4]
The HRU security model (Harrison, Ruzzo, Ullman model) is an operating system level computer security model which deals with the integrity of access rights in the system. It is an extension of the Graham-Denning model, based around the idea of a finite set of procedures being available to edit the access rights of a subject on an object .
Using x86 as an example, there is a special [clarification needed] gate structure which is referenced by the call instruction that transfers control in a secure way [clarification needed] towards predefined entry points in lower-level (more trusted) rings; this functions as a supervisor call in many operating systems that use the ring ...
The operating system must ensure that only specific operations can occur to the capabilities in the system, in order to maintain the integrity of the security policy. Capabilities as discussed in this article should not be confused with Portable Operating System Interface 1e/2c "Capabilities". The latter are coarse-grained privileges that ...
The STRIDE was initially created as part of the process of threat modeling. STRIDE is a model of threats, used to help reason and find threats to a system. It is used in conjunction with a model of the target system that can be constructed in parallel. This includes a full breakdown of processes, data stores, data flows, and trust boundaries. [5]
The model represents a system as directed graph, where vertices are either subjects or objects. The edges between them are labeled, and the label indicates the rights that the source of the edge has over the destination. Two rights occur in every instance of the model: take and grant. They play a special role in the graph rewriting rules ...