Pluggable Authentication Modules (PAM) allow the implementation of alternative authentication methods to the default UNIX authentication mechanism of prompting for a username and password. FreeBSD 4.x uses the Linux version of PAM but since FreeBSD 5.0, OpenPAM (http://trac.des.no/openpam) has been used instead. OpenPAM has also been available in NetBSD since 3.0.
Some of the alternative authentication methods supported by OpenPAM are
• One-time Passwords In Everything (OPIE)
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