Defcon's new badge is a security key you can see inside

It’s been a longtime feature of the annual Defcon hacker conference that attendees come away not only with knowledge of new software vulnerabilities and hacking techniques but also an elaborately designed conference badge—often electronic masterpieces embedded with intricate puzzles , complex crypto challenges, hidden Easter eggs , and even the mechanical gear trains of a watch. Each year’s badge creator endeavors to top previous designs and blow the minds of hard-to-impress hackers.