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There are, however, a few more sensible versions of the hack-hack method. The first of these, the short hack, is very straightforward testing of five to fifteen or thirty accounts. This method assumes that one of these accounts will have a single-character password, so it will try each account either twenty-six times (once for each letter of the alphabet) or fifty-two times (if both upper- and lowercase are needed). A hacker might do this testing manually, but since it is the type of tedious but systematic task that computers can do so well, it is more likely that the hacker will write a simple program to try all these variations and notify him when one of the variations is successful. This method has many problems of its own, but when it's successful, the hacker can often be on the system the day after he starts. Single-character passwords are very convenient for users to remember. And no hacker is going to argue with results. A second variation of the hack-hack method tackles the problem from the other side. It is called the reverse hack, and instead of trying many possible passwords on one account, it takes two or three very common passwords and tests them on anywhere from twenty to two hundred accounts. For example, the word password, obvious as it seems, is very often used by naive users. If a hacker had a list of twenty account names, he could use the reverse hack by programming his computer to call the remote system and try the word password as a
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( HAP T E R F I V E How a Hacker Hacks
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password on each of the account names. The reverse hack quite often bypasses some system security because, on many systems, the operator doesn't get notified of two or three unsuccessful log-on attempts on one account - the computer only notifies him about many unsuccessful attempts on one account. From my experience, it seems most people don't pay much attention to choosing their "secret" passwords. By browsing and experimenting, I've found that the three most common password choices are secret, love, and sex . .. though not necessarily in that order. Both the hack-hack and reverse-hack methods rely heavily on chance, so it is very hard to predict whether these methods will succeed in ten minutes or ten hours. A third variation, however, is perhaps the most often successful as far as these methods go. It is known as the database hack. The hacker who uses this method tries ten to twenty accounts, and he tries passwords to these from a data base, or "library," of anywhere from twenty to five hundred commonly used passwords. The data base contains words that the hacker knows to be common passwords. A typical file would contain such entries as: Love, Sex, Secret, Demo, Games, Test, Account, Intro, Password, Alpha, Hello, Kill, Beta, Dollar, Dead, System, Computer, Work, Yes, No, Please, Ok, Okay, God (popular with system operators), Superuser (another good one for sysops), Aid, Help, the name of the company, formatted in various ways, for example, MegaCar, Mcar, Megcar, Mega, Me, Car, the letters A through Z, two to four hundred first names, possibly ten or twenty names of pop musical groups, possibly five to ten names of automobiles, the digits 0 through 9. While it is quite often successful, the database hack is normally used only on systems where the system operator is either known to be sympathetic to hackers or just doesn't care, because this is another method that, with its repeated attempts on the system, will probably have the system operator waiting once the hacker gets in. The three hack-hack variations are very simple and are used mostly by novice hackers. Higher-level hackers prefer to use their wits, instead of a brute-force assault. One of the more sophisticated hacking tools is known as the decoy, and it comes in three versions.
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