| Computer Defense Strategy |
Many websites place very small files called cookies on your computer to keep track of your activities on the site. Other types of cookies may be used to track your overall web activities or to store your username and password information for a site so you do not have to enter it each time you visit the site. Most cookies are harmless but the mere presence of cookies on your PC could cause problems. Anyone who has access to your system when you're away can see not only which sites are storing cookies on your PC, but also the contents of unencrypted cookies.
Third-party cookies present a slightly greater privacy threat. These files usually come from banner ad services, which may use them to track your browsing at sites served by the ad network and subsequently present ads that target your interests. Spyware programs often flag and remove third-party cookies, but you can set your browser to bar them completely.
Although most cookies are harmless but some may furnish web sites with more information than you wish to reveal. Set your system to allow only cookies that you approve, and then only approve cookies from trusted sites that you revisit often. It may be nuisance to have to approve or disapprove cookies all the time, but it helps keep you protected.
To delete cookies individually, click Manage cookies under the Advanced tab in the Preferences dialog box, and either use the search field at the top of the window to find a specific cookie or browse the folders by Web site. As in Firefox, you must click each site's folder icon to display its cookies, which you can edit or delete by clicking the appropriate button.
You can block all cookies for a specific site, too (the default is to accept them): Select the site's folder (rather than the cookies under it), click Edit, and uncheck Use defaults for normal cookies, Accept cookies for server/domain, and/or Accept third party cookies for server/domain (see Figure 2). When you're done, click OK, Close, OK.
Your internet browser keeps track of all the websites you visit and stores them in the history file. That is how it is able to auto-complete sites when you type them in. Adware will often use your history file in determining which ads to display, so clear the history regularly.
To erase all entries from the History list, choose Tools, Preferences, Advanced, History, and click Clear next to 'Visited addresses'. To wipe out the browser's download history, press <Ctrl><Alt> T, right-click a downloaded file, and click either Remove transfer or Remove all finished (to clear all completed downloads from the list.
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