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Prevent Browser caching
Put this at the top of your theme template.php file:

header("Cache-Control: no-store, no-cache, must-revalidate, max-age=0");
header("Cache-Control: post-check=0, pre-check=0", false);
header("Pragma: no-cache");

 

Download and enable the SecKit module:
https://www.drupal.org/project/seckit
There are some nice default settings. We can review tweak these settings as part of a security review when we have more time.