Students get the keys, not the locks.That think-fast concept is taken one step further by Giovanni Vigna, whose Advanced Topics in Security class at the University of California, Santa Barbara inspired Black's. There the learning process is similar, but the class is also a proving ground for what's ultimately a test: iCTF, or International Capture The Flag, a competition where hackers across the world compete in a head-to-head, real-time hack-off. Each team--there were 80 teams of about a dozen at this year's competition--keeps a bit of code hidden on their computers, and every other team attempts to spirit away the other teams' code, while simultaneously defending their own. To do that, they need to know the ins and outs of both offensive and defensive hacking strategies. After spending weeks learning to "think about the stuff that the guy didn't think about," as Vigna describes it, they go in for competing against actual hackers.