I. Introduction You are a computer administrator for a large manufacturing company. In the middle of a production run, all the mainframes on a crucial network grind to a halt. Production is delayed costing your company millions of dollars. Upon investigating, you find that a virus was released into the network through a specific account. When you confront the owner of the account, he claims he neither wrote nor released the virus, but he admits that he has distributed his password to "friends" who need ready access to his data files. Is ....