"It is the only cryptographically sound car alarm system," Avi says, as if that settles the matter. He digs out a keychain attached to a black polycarbonate fob with the same dimensions, and number of buttons, as a television remote control. He enters a long series of digits and cuts off the voice in the middle of proclaiming that Randy and Avi are being recorded on a digital video camera that is sensitive into the near-infra red range.