walk*bound writes "In an essay published by ZDNet, security scientist Dan Geer has an interesting proposal for e-commerce sites to evaluate the trustworthiness of clients that try to connect. Assume that end users either always say 'Yes' or always say 'No' to security dialog boxes. Then make the decision one of two ways: 'When the user connects, ask whether they would like to use your extra special secure connection. If they say "Yes," then you presume that they always say "Yes" and thus they are so likely to be infected that you must not shake hands with them without some latex between you and them. In other words, you should immediately 0wn their machine for the duration of the transaction — by, say, stealing their keyboard away from their OS and attaching it to a special encrypting network stack all of which you make possible by sending a small, use-once rootkit down the wire at login time, just after they say "Yes."'"