Katie Moussouris, senior security strategist lead at Microsoft, discusses the software giant's recently announced Blue Hat competition, which offers $250,000 in cash and prizes to the winning researchers who develop advanced technologies to defend Windows against entire classes of vulnerabilities that can be exploited to bypass the platform's existing mitigations. Moussouris describes how Microsoft came up with the idea, why defensive research is just as important as one-off vulnerability discoveries and how the oft-cynical research community is reacting to the contest.