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basic security precautions; others are easy because the operating system is old and simply not as secure as the newer versions. But regardless of the reason, once such a system is discovered by one hacker, you can be sure that the word will get around to many more. Systems on a network. Other than the services they provide, an important difference exists between a privately owned computer that is accessed via one or a few public telephone lines and a more "universal" computer that is one of several on a dial-up network. Both types of computers respond to phone calls, and both types can be explored by a hacker with a modem. The big difference is, the privately owned computer has a limited (and known) group of users and its phone numbers are not very widely known. A computer on a network, on the other hand, has a much larger group of users (think of THE SOURCE, for example) and there is no limit to the number of people who know the phone number needed to access it. As I've mentioned throughout this book, systems on large public networks are likely to get a lot of hacker activity. Hackers can almost always call the network easily toll-free, and the chance of being traced through the network is very slim, if the hacker knows what he is doing. Networks have been described in various ways by hackers, but I think the best description came from a hacker known as The Wizard of ARPANET, who said, sometime in early 1982, "Networks are a hacker's fantasy." Of course, at that time, networks provided hackers with a real dreamworld: thousands of computers, accessible by phone, that had no better security, and thus were no more difficult to access, than any other computer. But now, since the number of hackers is growing so fast, the security of most systems on networks gets a healthy test as soon as the computer is put on the network. In fact, network computers are often more secure than many privately owned computers with phone links, just because more hackers quickly find and test the network's defenses. These days, hackers more often spend their time "scanning" phone numbers, hoping to find a private computer, than they do searching for a way through the tighter security barriers of a well-guarded network system. As I said, hackers are lazy (at least at this level of hacking) and would just as soon bump into an easily breached system.
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All this, however, doesn't mean to say that the owner or user of a network computer has no security worries at all. There are still a lot of hackers trying a lot of different computers, and some hackers are very good and very dedicated (remember the Tourist ). Some hackers are bound to get on some networks, and once they are there, it sometimes happens that the hacker doesn't have to be anything but persistent and likable to go farther.... For example: Sometimes, when exploring on a network, a hacker will come across an address (a remote computer) that seems dead. No matter what he types, the distant machine just sits there. Quite often, however, when this happens, the hacker can type in HELLO , enter a few Control-Gs (the character that makes a bell ring on the terminal at the other end), and someone will reply. If this happens, the other person is almost always someone in a computer room, and depending on who that person is, and where his sympathies lie, the hacker can sometimes talk him into helping out with an account or a password. In this case, hacking is a lot like walking up and ringing a doorbell. If this can happen on your system, make sure your sysops know how to say "No."
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No one wants to give away free computer time, but is security really worth $5000, plus $350 a user Or $12,000, plus $600 a user In the vast majority of cases, the answer is no. Despite all the recent quantum leaps in technology, we are not yet out of the ink-and-paper age. Computers are still an adjunct, and computer information is usually backed up several times, in more than one medium, for safekeeping. In terms of potential destruction of data, this backup process simply means that computers do not justify security as a major expense. If you want to keep your ~ystem safe from Crashers or bungling amateur hackers, I think that rather than spending a large amount of money on security, you could probably do much better by educating your users on keeping personal accounts secure. On the other hand, suppose your concerns are with the security of confidential information, or as I mentioned at the beginning of this chapter, finances - computer information that represents actual dollars that belong to someone. In this case, you not only need to back up
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