In looking at the resources available on Drupal security, we found that none of the available resources provided a regularly updated, holistic view. Web security is a complex subject and new challenges are arising all of the time. We saw the need for a resource that would allow Systems Administrators and Web Developers to have a practical view of what they can do to secure their systems.
This book is filled with resources to help people security experts understand Drupal & Drupal experts to better understand security.
For more information on Drupal security, see http://openconcept.ca