How does Linux know that the new password is similar to the previous one?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Over Ancient Waters Looping

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Chapters
00:00 Question
00:36 Accepted answer (Score 156)
01:52 Answer 2 (Score 46)
04:48 Answer 3 (Score 36)
05:15 Answer 4 (Score 7)
05:47 Thank you

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Full question
https://superuser.com/questions/857439/h...

Accepted answer links:
[PAM system]: http://www.linux-pam.org
[source code]: https://git.fedorahosted.org/cgit/linux-...
[the ]: http://www.linux-pam.org/Linux-PAM-html/...

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Tags
#linux #unix #security

#avk47