You don't need any 3rd party software to keep your Mac secure. That's all you need to do to keep your Mac completely free of any virus, trojan, spyware, keylogger, or other malware. For other software, it's safer to get updates from the developer's site or from the menu item "Check for updates", rather than installing from any notification window that pops up while you're surfing the web. Use Software Update for your Mac software. Always keep your Mac and application software updated.For added security, make sure all network, email, financial and other important passwords are long and complex, including upper and lower case letters, numbers and special characters.Don't open files that you receive from unknown or untrusted sources.Never let someone else have access to install anything on your Mac.If you're not sure about an app, ask in this forum before installing. Be careful to only install software from trusted, reputable sites.Change your DNS servers to OpenDNS servers by reading this.(This is not to be confused with JavaScript, which you should leave enabled.) Leave this unchecked until you visit a trusted site that requires Java, then re-enable only for your visit to that site. This will protect you from the Flashback malware and other malware that exploits Java in your browser. Uncheck "Enable Java" in Safari > Preferences > Security.
Uncheck "Open "safe" files after downloading" in Safari > Preferences > General.Make sure your built-in Mac firewall is enabled in System Preferences > Security > Firewall.
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