Kicksecure is a security-hardened Debian-based Linux distribution that applies a broad set of kernel and userspace hardening settings out of the box, reducing the attack surface without requiring manual configuration. It also serves as the foundation for the Whonix anonymity OS.
Kicksecure
Official website kicksecure.com
Our take
Where most distros leave hardening as optional reading in a wiki, Kicksecure ships it switched on by default: TCP ISN randomization, kernel lockdown parameters, strong umask, and a suite of security-misc settings drawn from years of Whonix development. Debian as a base means broad hardware and software compatibility. The trade-off is that Kicksecure is not immutable, so a compromised package or a root-level exploit can still alter the running system in ways that Fedora Atomic or secureblue resist. Best suited to users who want a hardened general-purpose desktop on familiar Debian ground, or who want to understand the Whonix/Kicksecure ecosystem before running the full anonymity stack.
GitHub at a glance
Kicksecure/security-misc
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Kicksecure alternatives
Qubes OS Qubes OS: A reasonably secure operating system
Tails Tails: Portable, encrypted and secure through the Tor network
Whonix A free, open-source desktop operating system that forces all traffic through Tor, run as two isolated virtual machines.
Fedora Workstation Fedora Workstation: User friendly and easy to setup
Ubuntu Ubuntu: User friendly and easy to setup
openSUSE Tumbleweed openSUSE Tumbleweed is a rolling-release Linux distribution that defaults to Btrfs with Snapper snapshots, letting you boot into a previous system state if an update breaks something. Available with KDE, GNOME, or Xfce.