Cyber attacks, once primarily directed against networks to steal confidential information and wreak virtual havoc, have begun to expand and are now directly affecting the physical world. For example, the recent hacking of the Associated Press’s Twitter account by the Syrian Electronic Army and subsequent tweet about an explosion at the White House caused the U.S. stock market to decline almost 1% before the news was revealed as a hoax. In 2010 the computer worm Stuxnet was discovered and implicated in the attack that caused physical damage to centrifuges at Iranian nuclear enrichment facilities. In 2012 a hacker built and revealed a simple device that can open Onity-brand electronic locks (which secure over 4 million hotel room doors) without a key.