vb.net barcode library Note If we assume there are 120,000 viruses for Windows and 50 for Linux, then in theory, there s in Java

Creation Code 39 Full ASCII in Java Note If we assume there are 120,000 viruses for Windows and 50 for Linux, then in theory, there s

Note If we assume there are 120,000 viruses for Windows and 50 for Linux, then in theory, there s
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99.999% chance that any virus ClamAV finds will be a Windows virus!
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Next, find the name of the virus in the Status column, and look it up online to learn more about it. This is the point at which you ll learn if it s a Linux virus and, if so, its potential impact on your system. In the example in Figure 9-23, the virus ClamTk found is called Exploit.IFrame.Gen-1. In addition to searching for Exploit.IFrame.Gen-1, we also added ClamAV to the search string to see if there was any specific information about this virus being found by the scanner, and check if the report was a false positive. You can hover your mouse over the filename in the scanner window to see its path. If the file is located in your Firefox cache, as in this example, then there s nothing to worry about, and the file can be deleted with impunity just right-click and select Delete from the menu. In fact, the Firefox cache is where you re most likely to find virus infections, because this is where all the files are temporarily downloaded when you re browsing the web (including HTML files, images, and so on). But, once again, you should remember that most nefarious web sites that attempt to spread virus infections are targeted at Windows users, usually via security holes within Internet Explorer. As a Linux user using the Firefox web browser, you have far less to worry about.
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CHAPTER 9 HOW TO SEC URE Y OUR COMPUTE R
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WEB BROWSER SECURITY
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It s not enough to rely on antivirus software for safe web browsing. In Firefox, you can tweak settings to enhance the security of browsing. However, note that improved security sometimes equates to reduced features, which can be quite frustrating. To set security options in Firefox, select Edit Preferences. Settings on the following tabs affect browser security: Content: You can disable pop-up windows and disable JavaScript and Java. Note that it s quite unlikely that you would want to completely disable JavaScript, since many modern web sites make heavy use of it (including online shopping sites and web-based e-mail, such as Google s Gmail). You could add exceptions for certain web sites, but an easier way is to use a third-party plug-in called NoScript (http://noscript.net). This tool allows you to disable JavaScript, Java, Flash, and other plug-ins that could potentially be harmful to Firefox on all web sites by default. You can easily reenable these scripts on each web site that you trust through the NoScript applet, located in the lower-right corner of the browser window. Privacy: You can customize retention of browser history, cookies, and private data. If privacy is of utmost importance, you can check the Always clear my private data when I close Firefox check box in the Private Data section, click the Settings button, and select which of the items to delete when you close Firefox. Security: You can customize attack site and forgery detection, passwords, and warning messages. You should customize these settings based on how you use the Web. For example, it s obvious that the Warn me when sites try to install add-ons option should be checked, since malware is distributed this way. And if you transact business on the Web, the Tell me if the site I m visiting is a suspected forgery option offers added protection from getting duped.
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Summary
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In this chapter, we ve looked at what threats your system faces and how security holes can be exploited by malicious interests. You learned about measures you can take to protect your system, such as updating it online, using AppArmor to guard against errant applications, configuring the system s firewall, using encryption for e-mail and file privacy and authentication, installing an antivirus program, and customizing web browser security. We also discussed some common-sense rules you can follow to keep your system safe. In the next chapter, we move on to looking at how your Ubuntu system can be personalized and how to set up everything to suit your own preferences.
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