V-38570: The system must require passwords to contain at least one special character.
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Requiring a minimum number of special characters makes password guessing
attacks more difficult by ensuring a larger search space.

Details: `V-38570 in STIG Viewer`_.

.. _V-38570 in STIG Viewer: https://www.stigviewer.com/stig/red_hat_enterprise_linux_6/2015-05-26/finding/V-38570

Notes for deployers
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