The Fool's Run

people will live. Or, in some cases, where they will fight.
    The attack on Whitemark began after breakfast on a beautiful August morning. Maggie and I split a bag of bagels and a pot of coffee, chatted and laughed, cleaned up the kitchen, and went to war. The attack lasted precisely four weeks: twenty-eight days to the hour.
    The first moves were invisible to Whitemark. We infested their system with a virus. A virus is a chunk of computer code, compact and deadly. Once a virus has infected a computer’s system software, it makes copies of itself and inserts them into the working programs being run through the system. The working program, in turn, infects other operating systems. Unless the virus is detected, it will eventually infect every program that passes through the system. And those programs will infect every other program they encounter.
    Besides replicating itself, the virus usually does damage. Not always. There are Christmas card viruses, for example, that insert graphic Christmas cards in every text file they find. When somebody opens the computer file, the first thing that appears is the Christmas card.
    The disease viruses are a different story. They are killer bugs. They erase information, jumble it, destroy expensive, one-of-a-kind custom programs. There are some viruses, more complicated than the straight-out bombs, that may change a system’s programming in more subtle ways.
    Our first virus was not subtle. It was a bomb, pure and simple. Forty-five days after being inserted in the Whitemark computer system (viruses can count), it would explode. Any Whitemark program containing a virus would be thoroughly and irretrievably jumbled. Nothing would come out of the company’s computers but garbage.
    “Why forty-five days?” Maggie asked, when I explained the virus to her. We were in the Whitemark computer using the special entry codes I had created for us.
    “The Whitemark programmers will eventually catch on to what we’re doing. We’ve got three or four weeks at the most. If their top systems man is busted on the porno charge, we may get a few more days out of the confusion. Anyway, when the trouble starts, they’ll do the routine system checks. That will take a couple of days. When nothing works, they’ll start sweating. Eventually, they’ll figure it out. They’ll realize they’re under attack, and they’ll shut down outside access. There are some ways around that, but only for a day or two. At that point, we’ll be fifteen or twenty days out, and they’ll call in the FBI, or somebody like that, to look for us. They’ll be worried about sabotage.
    “Once they get everything shut down, there’ll be a couple of weeks of confusion. They’ll be paranoid about the system. They’ll run all kinds of tests. Then they’ll start repairs, bringing in new software. Checking it. That should get us five or six weeks down the road. So then, at six and a half weeks, the bomb explodes. It’ll be the finishing touch. They won’t recover before the contract deadlines.”
    She thought about it for a minute, nibbling on her lower lip. “So what’s the first move after you get the viruses in? The first thing that will affect them? If we don’t hurt them soon, it’ll be too late.”
    “I’ll start on that tonight,” I said. “Most of their design work is done at individual work stations, but all the stations are tied into the central computer. I can get to them when they’re not being used. I’ll start by hacking up the math programs. Engineers run a million numbers through their computers. I’ll stick in a program that will add or subtract various small percentages on certain calculations. It won’t be quite random. Identical calculations will come out the same way every time, so if they check their work, it’ll be confirmed. But it’ll all be wrong.”
    She didn’t understand. “What’s the practical effect?” she asked. “Tell me a practical effect.”
    “Okay. Say you were designing a screw-in gas cap for your Porsche. There’s a male part and a female part. The threading has to be the same on both parts. Say the twist on the male part is altered just slightly—the pitch is changed a few degrees. The cap becomes worthless. You can’t look at the plans and tell that it’s worthless; you can’t tell it’s worthless when you’re making it. It looks fine right up to the time you try to screw the parts together. Then they don’t work. And the whole problem is in a