Security begins from the ground up, starting with the installation of the operating system. An example of the BSD installation philosophy is embodied in one of OpenBSD's security goals: to provide an installation that is "secure by default" so novice users don't have to become security experts overnight. Each of the installation programs provided by FreeBSD, NetBSD, and OpenBSD provides a choice of which "sets" are installed, making it easy to install a bare-bones yet fully functional operating system. In security, less is more as you can't exploit what doesn't exist. This means it is better to install very little and add what functionality you'll use than to do a larger install and have to strip out what you don't need.
Once installed, all of the BSDs provide the security features described next.
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