c# qr code library Part 2: Keeping Your System Secure in Visual C#.NET

Encoder QR Code in Visual C#.NET Part 2: Keeping Your System Secure

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Part 2: Keeping Your System Secure
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Securing Your Internet Connection
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What s New in Service Pack 2 . . . . . . . Setting Up Your Internet Connection. . . Protecting Your System from Unsafe and Unwanted Software . . . . . . . . . . . . Defining Security Zones for Web Sites . 284 287 293 306 Blocking Objectionable Content . . . . . . . 311 Using E-Mail Safely. . . . . . . . . . . . . . . . . 314 Protecting Your Privacy . . . . . . . . . . . . . 318 Finding Additional Security Resources. . . . . . . . . . . . . . . . . . . . . . . . 322
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Your connection to the Internet lets you download music files, load your favorite Web sites in a browser window, and receive e-mail from just about anywhere. Unfortunately, that connection can also carry dangerous data, such as viruses and spyware. Some rogue programs arrive as e-mail attachments; others are disguised as seemingly innocuous downloads. A malicious intruder who convinces you to install an unsafe program or figures out how to exploit an unpatched security hole can connect to your computer and poke around in your personal files, or install a program that allows him to literally take over your computer. To put it in the simplest possible terms: When your computer is connected to the Internet, you re at risk. That fact is undeniable, but it needn t be alarming. You can manage the risk if you understand its nature and take some relatively simple and straightforward precautions. In the original release of Microsoft Windows XP, Internet Explorer offered only a modest degree of protection against the possibility of downloading and installing unsafe or unwanted programs including spyware and viruses. It took exceptional care, constant vigilance, and advanced skills to avoid infection. Service Pack 2 significantly enhances the ability of Windows XP to prevent hostile code from being installed in the first place, without requiring intervention on your part, and it provides new tools that allow you to disable, remove, and otherwise manage browser add-ons.
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At Home with Windows XP
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All of the tools, techniques, and protective measures we discuss in this chapter are available in both Microsoft Windows XP Home Edition and Windows XP Professional.
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Part 2: Keeping Your System Secure
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Microsoft Windows XP Inside Out, Second Edition Internet Explorer also allows you to categorize Web sites according to the degree of trust you accord them. Based on a site s reputation or your own direct knowledge of it, you can apply stricter or more lenient security standards. Thus, you can deal with the Web in much the same way you deal with the world at large giving reputable Web sites and other trusted contacts the benefit of the doubt and exercising greater caution with unknown or suspicious parties. In 6, Security Essentials, we introduced the basic components that make up the Windows XP security infrastructure. In this chapter, we provide additional details about how to protect your Internet connection, with a special emphasis on security features in Internet Explorer and Microsoft Outlook Express. And because they re closely related to issues of security, we also discuss some measures you can take to enhance your privacy online.
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What s New in Service Pack 2
Some of the most important features in Windows XP Service Pack 2 (SP2) are specifically designed to increase your security as you move around on the Internet. This partial list includes some of the new features, as well as some existing features that have been improved:
Restrictions on automatic downloads in Internet Explorer
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You now have to specifically approve any software download, and Web page designers can no longer repeatedly prompt you to download a file or install a program. If you re familiar with earlier versions of Windows, you ll note a cleaner download dialog box, with a new file handler icon and explanatory text along the bottom of the box. In addition, behind the scenes, Windows now checks for publisher information in all executable files. This option eliminates a major annoyance and lessens the likelihood that an unsophisticated user will be tricked into clicking an unsafe link. (We discuss this feature in more detail in Blocking Pop-Ups, page 444.) ActiveX controls are executable programs that enable or enhance features in other programs; they re most commonly used to add capabilities to Internet Explorer. Unfortunately, ActiveX controls can also deliver spyware, adware, or other hostile code. With SP2, you decide when to install an ActiveX control; Web pages are no longer allowed to display an Authenticode dialog box that forces you to reject an ActiveX control. In addition, unsigned ActiveX controls are blocked from installation unless an administrator specifically changes default system security settings. The open architecture of Internet Explorer makes it easy to add toolbars, search panes, and utility programs that expand the capabilities of the browser. Used properly, this feature can make Web browsing more productive. However, poorly written add-ons can cause frequent browser crashes, and some add-ons contain code that produces undesired effects, such as spawning pop-up
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