Twitter is reportedly working on a two-factor authentication system. Wired writes that the company is currently testing the new security solution internally before rolling it out to the public. Following a number of high-profile hacks, including that of Wired editor Mat Honan, several companies have shifted to two-factor authentication, including Apple, Microsoft, and others. Today’s hack of the Associated Press account provides a vivid illustration of the need for some kind of enhanced security after a fraudulent claim of explosions at the White House sent the Dow plummeting by 100 points. Two-factor authentication relies on two pieces of information to confirm a user’s identity. Implementations typically check for access to a mobile device by requiring you to enter the content of an SMS or similar message in addition to your standard password.