Dustin Childs can still describe the best demonstration of a winning hack at an international tournament he’s ever seen. It happened almost a decade ago.

The participants had to find a way to break into a Windows workstation that was hardened with firewalls and up-to-date software to make it more secure. One member of a team from China typed an IP address into the Windows browser, he said, "and took their hands off the keyboard, and that was it.”