Raven nodded. "Quite possibly them. In any event, whoever used Yoshimura's account left himself a backdoor into the Natural Vat system’s personnel files. Valerie located it with no trouble at all and we set up a sentinel program to watch it. Another decker, a man who styles himself Jack the Ripper, used that opening to get into that area and take a copy of your personnel file. We could not trace him at the time, though we did discern his identity later. However, assuming he had taken your file because it was important, we appropriated a copy and began an analysis."