Police are heading back to the classroom as a new breed of criminals turns to the Internet to prey on unsuspecting victims. Across Europe and beyond, cyber investigators are being trained in computer forensics — a crime-fighting technique that is part science, part sleuthing. Investigators comb through seized computer hard drives, looking amid countless disguised files for evidence the machine was used in a crime. The clues could be elaborate computer programs designed to hijack a victim’s PC, or e-mail and Web browsing logs revealing the identity of conspirators. “It’s akin to auto mechanics,” said Dan Haagman, head of training for 7Safe Ltd, a Cambridge-based firm that instructs police and civilians in computer forensics. “You rule out things early on. You search for signs that give you a picture of a particular security breach,” he added. The same techniques can be used to trace or at least build a profile of a criminal suspect from a hacked PC or computer network, he said. Full Story