Frankie Jarrett

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Harden the security of your site by preventing unauthorized access to stale user accounts.
This plugin is also ideal for sites needing to meet certain industry security compliances – such as government, banking or healthcare.
In the plugin settings you can set the maximum number of days users are allowed to use the same password (90 days by default), as well as which user roles will be required to reset their passwords regularly (non-Administrators by default).
Languages supported:
<ul>
<li>English</li>
<li>Czech</li>
<li>Español</li>
</ul>
Development of this plugin is done <a href="https://github.com/fjarrett/expire-passwords" rel="nofollow ugc">on GitHub</a>. Pull requests welcome. Please see <a href="https://github.com/fjarrett/expire-passwords/issues" rel="nofollow ugc">issues reported</a> there before going to the plugin forum.

Expire Passwords

Require certain users to change their passwords on a regular basis.

harrym

WordPress uses phpass to store passwords. Because WordPress has to work everywere, it uses the portable version of phpass, 
which uses MD5 to hash passwords. MD5 is not a very good hashing algorithm for passwords, because it’s relatively fast.
This plugin switches over to bcrypt, which is the algorithm recommended by phpass, and is a much better option for password 
storage because it is much slower to produce. This makes it much harder for an attacker who’s managed to access your hashed 
passwords to obtain plain text passwords by brute-forcing, or by trying passwords from a dictionary.
Note: this plugin requires PHP 5.3.0 or newer
Be aware that if you use this plugin and then move to a host that does not support bcrypt, you will need to reset any user 
account that you want to log in with.

wp-bcrypt

wp bcrypt switches WordPress's password hashes from MD5 to bcrypt, making it harder for them to be brute-forced if they are leaked.

Expire Passwords vs wp-bcrypt