Then by using not one but two copy stores, Arturo made himself extra safe when he went to pick up the fax. A variation on this that makes the fax even more difficult to trace: Instead of having the document sent to another copy store, the attacker can give what appears to be a fax number, but is really an address at a free Internet service that will receive a fax for you and automatically forward it to your email address. That way it can be downloaded directly to the attacker's computer, and he never has to show his face anyplace where someone might later be able to identify him. And the email address and electronic fax number can be abandoned as soon as the mission has been accomplished.