"I also want you to call me back in precisely one hour," I go on quickly, before she can reply. "The number’s at the end of the datafile. For obvious reasons it’s a multi-node relay, but don’t try tracing it. The relay will only be active for two minutes, starting precisely sixty minutes from my mark, so you’ll be dead-ending yourself. If you don’t call me back within the time-span, the file goes to the snoops. Scan me?" Again I don’t wait for an answer. "Open your capture file, here comes the data. Oh, and ... mark."