GETTING EVERYTHING UP AND RUNNING in Font

Generating Code 39 in Font GETTING EVERYTHING UP AND RUNNING

CHAPTER 7 GETTING EVERYTHING UP AND RUNNING
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In this chapter, you learned how to set up the common types of hardware you might have attached to your computer. Additionally, you looked at configuring various software components that are vital for Ubuntu s correct functioning. You stepped through getting online with Ubuntu (including joining a wireless network), adding a printer, connecting to a digital camera, configuring a 3D graphics card, and much more. In 8, we move on to look at how you can ensure that your system is secure and protected.
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CHAPTER 8
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Linux is widely considered one of the most secure operating systems available. On a basic level, Linux is built from the ground up to be fundamentally sound, and it allows users to work securely without their even noticing it. For instance, it enforces the system of ordinary users who are limited in what they can do, thus making it harder for security breaches such as virus infections to occur. In addition, Linux contains a firewall that is hardwired into the kernel, called iptables (http://www.netfilter.org). The firewall is considered among the best solutions by practically all computer security experts. Not only that, but it can protect your home PC just as well as it can protect the most powerful supercomputer. Like many Linux components, iptables can be managed the hard way or the easy way. The hard way requires in-depth knowledge of how networks operate and an ability to hack configuration files, both of which are beyond the skills of many ordinary computer users. Fortunately, several programs act as interfaces to iptables and make it simple to operate (or at least as simple as any equivalent Windowsbased software firewall, such as ZoneAlarm from Check Point Software Technologies). In Ubuntu, this built-in firewall is turned off by default. This is because the developers don t think that Ubuntu requires a firewall, and on a technical level, they re correct. Unlike Windows, Ubuntu has no Internet-facing services (programs that wait for connections from the Internet or local area network). It was just such a service on Windows XP that allowed the Blaster worm to bring the Internet to its knees in 2003 (see http://en.wikipedia.org/wiki/Blaster_worm). Expressed metaphorically, the theory is that without any windows or doors, Ubuntu is difficult, if not impossible, for hackers to break into (or for viruses or worms to infect). However, configuring the firewall with a program like Firestarter, which we examine later in this chapter, can be done so quickly and with such little effort that, in our opinion, there s no reason not to use the Linux firewall. In addition, as with most versions of Linux, Ubuntu doesn t come with antivirus protection out of the box. This is because there are practically no viruses affecting Linux, and it is reasoned that there simply isn t a need for virus protection. However, as with a firewall configuration program, installing an antivirus program is easily done, and we explain how in this chapter. But first, we spend some time examining more-basic security concepts. Following that, we look at how to set up encryption for files and e-mail so they can be opened only by the intended recipients. Then we cover some elementary steps that you can take to protect your system.
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Windows Security vs. Linux Security
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If you ve switched to Ubuntu from Windows, there s a very good chance that the security failings of Windows featured in your decision. Windows 7 contains many improvements, but Microsoft s record on security over the past few years has not been great. New and serious security warnings have appeared on an ongoing basis, and even now, new and devastating viruses and Trojans make news headlines with worrying frequency (usually described as a PC virus rather than what it actually is a Windows virus).
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