Security-focused Operating System
This is a list of operating systems with a sharp security focus. Here, "security-focused" means that the project is devoted to increasing the security as a major goal. As such, something can be secure without being "security-focused." For example, almost all of the operating systems mentioned here are faced with security bug fixes in their lifetime; however, they all strive to consistently approach all generic security flaws inherent in their design with new ideas in an attempt to create a secure computing environment. Security-focused does not mean security-evaluated operating system, which refers to operating systems that have achieved certification from an external security-auditing organization. An operating system that provides sufficient support for multilevel security and evidence of correctness to meet a particular set of government requirements is called a "trusted operating system".
The list is alphabetical and does not imply a ranking.
Read more about Security-focused Operating System: BSD, Linux, Solaris, Object-capability Systems
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