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credit card numbers, and bank account numbers What s the PIN for your ATM, credit card, or phone card What s your password to log on to the network at work Where do you keep your spare house key The point is that we all have information we want kept private. Sometimes the reason is simply our natural desire for privacy; we would feel uncomfortable if the whole world knew our medical history or financial details. Another good reason is self-protection thieves could use some kinds of information to rob us. In other words, the motives for keeping a secret are not automatically nefarious. Corporations also have secrets strategy reports, sales forecasts, technical product details, research results, personnel files, and so on. Although dishonest companies might try to hide villainous activities from the public, most firms simply want to hide valuable information from dishonest people. These people may be working for competitors, they might be larcenous employees, or they could be hackers and crackers: people who break into computer networks to steal information, commit vandalism, disrupt service, or simply to show what they can do.
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In the past, security was simply a matter of locking the door or storing files in a locked filing cabinet or safe. Today, paper is no longer the only medium of choice for housing information. Files are stored in computer databases as well as file cabinets. Hard drives and floppy disks hold many of our secrets. How do you lock a hard drive
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Before we talk about how computer data is protected, let s take a brief look at how computers get and store information. The usual way to access data on a computer or network is to go through the operating system (OS), such as DOS, Windows, Windows 95, Windows NT, MacOS, UNIX, Linux, Solaris, or HP/UX. The OS works like an application, taking input, performing operations based on the input, and returning output. Whereas, for
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example, a spreadsheet application takes the numbers you type into it, inserts them into cells, and possibly performs calculations such as adding columns, an OS takes your commands in the form of mouse clicks, joysticks, touch screens, or keyboard input-commands such as show a listing of the files in this directory and performs the request, such as printing to the screen a list of files. You can also ask the OS to launch a particular application say, a text editor. You then tell the text editor to open a file. Behind the scenes, the editor actually asks the OS to find the file and make its contents available to the editor. Virtually all computers built today include some form of protection courtesy of the OS. Let s take a look at how such protection works.
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Virtually all operating systems have some built-in permissions, which allow only certain people access to the computer (its hard drive, memory, disk space, and network connection). Such access is implemented via a login procedure. If the user does not present the appropriate credentials (perhaps a user name and password), the OS will not allow that individual to use the computer. But even after a user is logged in, certain files may still be off-limits. If someone asks to see a file, the OS checks to see whether that requester is on the list of approved users; if not, the OS does not disclose the contents (see Figure 1-1). Access to most business computers and networks is controlled by someone known as a superuser or system administrator (often shortened to sys admin). This system administrator is the person charged with creating and closing user accounts and maintaining the systems and network. A typical task of this superuser account is to override protections. Someone forgot a password A file is read-protected (meaning that it cannot be opened and read) The superuser has permission to circumvent the OS permissions to respond to these problems. (This is where the name superuser comes from; this individual can do anything.) How does the OS know that the person requesting such system overrides is the superuser The OS grants this access by user name and password. The superuser user name is usually su or root or administrator. Unfortunately, techniques for circumventing these default defenses are widely known.
Figure 1-1
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