passwdqc - password/passphrase strength checking and enforcement
passwdqc is a password/passphrase strength checking and policy
enforcement toolset, command-line programs (pwqcheck and pwqgen),
and a library (libpasswdqc).
pwqcheck and pwqgen are standalone password/passphrase strength
checking and random passphrase generator programs, respectively,
which are usable from scripts.
pam_passwdqc is a simple password strength checking module for
PAM-aware password changing programs, such as passwd(1).
libpasswdqc is the underlying library, which may also be used
from third-party programs.
To enable pam_passwdqc in Slackware you need to replace any other
password strength checking PAM modules like pam_pwquality.so in
/etc/pam.d/system-auth with the following line:
password requisite pam_passwdqc.so
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