List of security-focused operating systems

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.

• GrapheneOS is a Security-focused, Android-based mobile OS that uses a hardened kernel, C library, custom memory allocator (hardened_malloc), and custom privacy and security focused Chromium based browser named Vanadium^[1]. it also offers privacy/security features, such as Duress PIN/Password or disabling the USB-C port at a driver/hardware level to avoid exploitation. it enables multiple exploit mitigations such as memory tagging, secure app spawning, restricted dynamic code loading, and more.^[2]

• Linux Kodachi is a security-focused operating system.^[3]
• Tails is aimed at preserving privacy and anonymity.^[4]
• KickSecure is a security-focused Linux distribution that aims to be "hardened by default". It uses network hardening, kernel hardening, Strong Linux User Account Isolation, better randomness, root access restrictions, and app-specific hardening.^[5]
  • Whonix is an anonymity focused operating system based on KickSecure. It consists of two virtual machines, And all communications are routed through Tor.^[6][7][8]

• Alpine Linux is designed to be small, simple, and secure.^[9] It uses musl, BusyBox, and OpenRC instead of the more commonly used glibc, GNU Core Utilities, and systemd.^[10]
• Owl - Openwall GNU/Linux, a security-enhanced Linux distribution for servers.
• Secureblue, a Fedora Silverblue based distro that uses a hardened kernel, custom memory allocator (hardened_malloc), Trivalent, a security-focused, Chromium-based browser inspired by Vanadium, and many other exploit mitigations.^[11]

• OpenBSD is a Unix-like operating system that emphasizes portability, standardization, correctness, proactive security, and integrated cryptography.^[12]

• Qubes OS aims to provide security through isolation.^[13] Isolation is provided through the use of virtualization technology. This allows the segmentation of applications into secure virtual machines.

• Computer security
• Comparison of operating systems
• Comparison of mobile operating systems
• Security engineering

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