passwdqc is a plugin password strength checker for OpenBSD's /usr/bin/passwd. It is basically a thin wrapper around Solar Designer's excellent password complexity checking code from pam_passwdqc. It allows more control over password quality enforcement than the built-in checks in passwd(1).
(also at http://www.mindrot.org/files/passwdqc/passwdqc.tgz)
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