Philosophers have long discussed our trusting nature -- and our distrust doesn't go very far. I have quickly discovered this, after gunmen held me for an hour-and-a-half on Tuesday -- and threatened to come back for me. They took me when all of my connections were live. If someone received a message from me now, or sent me one, who could tell whether it was me? Here is one of several examples (see the image). It is my bank, issuing a code for a query. Which query? Similarly, my mobile operator, and others. Or someone e-mails me about a rendezvous. Whoa. OBSERVATION: If something really goes wrong, not much is geared for it.