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This is a list of operating systems specifically focused on security.Similar concepts include security-evaluated operating systems that have achieved certification from an auditing organization, and trusted operating systems that provide sufficient support for multilevel security and evidence of correctness to meet a particular set of requirements.
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 ...
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 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.
To gain performance and determinism, some systems place functions that would likely be viewed as application logic, rather than as device drivers, in kernel mode; security applications (access control, firewalls, etc.) and operating system monitors are cited as examples.
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 .
The national security community responded to the challenges in two ways: the Office of the Secretary of Defense commissioned a study of the policy and technical issues associated with securing computer systems, while ARPA funded the development of a prototype secure operating system that could process and protect classified information.
Multilevel security or multiple levels of security (MLS) is the application of a computer system to process information with incompatible classifications (i.e., at different security levels), permit access by users with different security clearances and needs-to-know, and prevent users from obtaining access to information for which they lack authorization.