High Quality Content by WIKIPEDIA articles! BSD Authentication, otherwise known as BSD Auth, is an authentication framework and software API employed by some Unix-like operating systems, specifically OpenBSD and BSD/OS, and accompanying system and application software such as OpenSSH and Apache. It originated with BSD/OS and although the specification and implementation were donated to the FreeBSD project by BSDi, ultimately OpenBSD chose to adopt the framework in release 2.9. Pluggable Authentication Modules (PAM) serves a similar purpose on other operating systems such as Linux, FreeBSD and NetBSD. BSD Auth performs authentication by executing scripts or programs as separate processes from the one requiring the authentication. This prevents the child authentication process from interfering with the parent except through a narrowly defined inter-process communication API, a technique inspired by the principle of least privilege and known as privilege separation. This behaviour has significant security benefits, notably improved fail-safeness of software, and robustness against malicious and accidental software bugs.

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