The hunt for the hacker who broke into Republican vice presidential candidate Sarah Palin’s personal e-mail account is shaping up to be a remarkably simple investigation, by the standards of major cybersecurity whodunits. U.S. investigators figure the hacker claimed responsibility in a detailed accounting that included his own personal e-mail address and that he tried to cover his trail using a U.S. Internet anonymity service that has been surprisingly cooperative with the FBI in efforts to peel away that anonymity. Not exactly the plot of a Hollywood thriller.