
`Boring and hot.'
Phelps sighed. `Don't blame me. I didn't choose it.'
Graves did not reply. They continued down a corridor and came upon a guard, who nodded to Phelps.
`Good morning, Mr Phelps.' And to Graves: `Good morning, sir.' Phelps flashed his pink card; so did
Graves. The guard allowed them to pass farther down the corridor past a large banner that read FIRST
CWS SERVICE ON COACH.
`You've got a guard already,' Graves said.
`There's a lot of expensive equipment to look after,' Phelps said. They made a right turn and entered a
conference room.
There were just four of them: Graves; Phelps, looking springy and alert as he greeted everyone; Decker,
who was thin and dark, intense-looking; and Venn, who was nearly fifty, greying, sloppy in his dress.
Graves had never met Decker or Venn before, but he knew they were both scientists. They were too
academic and too uncomfortable to be anything else.
Phelps ran the meeting. `This is John Graves, who is the world's foremost expert on John Wright.' He
smiled slightly. `Mr Graves has plenty of background, so you can speak as technically as you want.
Decker, why don't you begin.'
Decker cleared his throat and opened a briefcase in front of him, removing a sheaf of computer printout.
He slipped through the green pages as he spoke. `I've been working in Special Projects Division for the
last six months,' he said. `I was assigned to establish redundancy programmes on certain limited-access
files so that we could check call-up locations to these data banks, which are mostly located in Arlington
Hall in Washington.'
He paused and glanced at Graves to see if the information was making sense. Graves nodded.
`The problem is basically one of access-line proliferation. A data bank is just a collection of information
stored on magnetic tape drums. It can be anywhere in the country. To get information out of it, you need
to hook into the main computer with an access substation. That can also be anywhere in the country.
Every major data bank has a large number of access substations. For limited or special-purpose access -
stations that need to draw out information once or twice a week, let's say - we employ commercial
telephone lines; we don't have our own lines. To tie in to a peripheral computer substation, you telephone
a call number and hook your phone up to the computer terminal. That's it. As long as you have a
half-duplex or full-duplex telephone line, you're in business.'
Graves nodded. `How is the call number coded?'
`We'll come to that,' Decker said, looking at Venn. `For now, we'll concentrate on the system. Some of
the major data banks, like the ones held by Defence, may have five hundred or a thousand access lines.
A year ago, Wilkens' congressional committee started to worry about unauthorized tapping into those
access lines. In theory, a bright boy who knew computers could tap into the system and call out any
information he wanted from the data banks. He could get all sorts of classified information.'
Decker sighed. `So I was hired to install redundancy checks on the system. Echo checks, bit additions,
that sort of thing. My job was to make sure we could verify which stations drew out information from the
data banks, and what information they drew. I finished that work a month ago.'