The Massachusetts Bay Transportation Authority has sued three students and their school, MIT, hoping to stop them from disclosing flaws in the MBTA's electronic ticketing system. The lawsuit claims that the presentation would cause "significant damage to the MBTA's transit system," according to an online posting of the suit, filed Friday with the U.S. District Court for the District of Massachusetts. It names students Zack Anderson, Russell "RJ" Ryan and Alessandro Chiesa, who are scheduled to talk about "The Anatomy of a Subway Hack: Breaking Crypto RFIDs & Magstripes of Ticketing Systems" at the Defcon conference on Sunday at 1 p.m. local time. The MIT students and an MBTA lawyer did not return calls and e-mail messages seeking comment.