Security testing is a specialization in the world of software QA. It takes a lot of expert-level knowledge and a good deal of thinking outside the box to be able to pinpoint security vulnerabilities and predict what hackers will do. There’s lots of ways you can get started on the path of becoming a security testing expert, and they all begin with research and learning.
Here’s a video by Scientific America’s Instant Egghead series that explains the basics of a Denial of Service attack and how companies can help protect themselves. DOS attacks are one of the more common security issues today and no on is immune. Learning about them is a good place to start getting into security testing. You can find more helpful resources below the video.
If you want to know more, here are additional resources to help you become a security tester or help you make your app more secure from attacks: