UNDERGROUND

and password. Once inside, a program in System X polled the exchange for important statistics, such as the number of calls coming in and out of the base. This information was then stored on System X. Whenever someone wanted a report on something, for example, the military sites with the most incoming calls over the past 24 hours, he or she would simply ask System X to compile the information. All of this was done automatically.

Anthrax had read some email suggesting that changes to an exchange, such as adding new telephone lines on the base, had been handled manually, but this job was soon to be done automatically by System X. It made sense. The maintenance time spent by humans would be cut dramatically.

A machine which gathers statistics and services phone exchanges remotely doesn't sound very sexy on the face of it, until you begin to consider what you could do with something like that. You could sell it to a foreign power interested in the level of activity at a certain base at a particular time. And that is just the beginning.

You could tap any unencrypted line going in or out of any of the 100 or so exchanges and listen in to sensitive military dis- cussions. Just a few commands makes you a fly on the wall of a general's conversation to the head of a base in the Philippines. Anti-government rebels in that country might pay a pretty penny for getting intelligence on the US forces.

All of those options paled next to the most striking power wielded by a hacker who had unlimited access to System X and the 100 or so telephone exchanges. He could take down that US military voice communications system almost over- night, and he could do it automatically. The potential for havoc creation was breathtaking. It would be a small matter for a skilled programmer to alter the automated program used by System X. Instead of using its dozen or more modems to dial all the exchanges overnight and poll them for statistics, System X could be instructed to call them overnight and reprogram the exchanges.