It\u2019s Black Hat and DefCon conference time again, when the world\u2019s top security researchers descend on the den of iniquity that is Las Vegas in August and try to scare the bejeezus out of people with new research into ominous hacks. Hooray! WIRED\u2019s been there for a few days already. Lily Hay Newman discovered that several mobile credit card readers are rife with bugs, potentially leaving you exposed.