Here are a few items to help with checking and improving the security of your system:

• See the Mac OS X Technologies Safe and sound web page for an overview of Mac OS X security features, including a link to view and download the "Security Technology Brief" PDF document.
• Be sure that you are running the latest version of system software. Apple will release security updates from time to time, and having the latest available system software version should improve the security of your system. Check the Security Updates page for more information.
• In addition to the Mac OS X built-in security features, the Macintosh Products Guide contains offerings from third-party providers that could help to increase the security of your system in particular situations.
• Apple is augmenting its commitment to security by seeking Common Criteria certification for both Mac OS X and Mac OS X Server.