tends to do so using techniques (Web site hosting) other than
tends to do so using techniques other than e-mail. For example, a worm mightslowly infect one file after the next on your computer, until things get so out ofhand you can t even start or shut down the computer. A Trojan horseis a potentially bad program. A Trojan horse doesn t replicateitself and most likely won t do any harm to your computer. For example, a pro- gram capable of digging lost passwords out of files is considered a Trojanhorse. On the one hand, such a program can be a lifesaver if you save somedocument using a password, then forget the password. On the other hand, allowing such a program onto a corporate network could be bad news for corporate security, because people could use it to break into other peoples password-protected files. In other words, whether or not the program is baddepends on how you intend to use it. The majority of viruses are spread through e-mail attachments. I see them goby all the time. For example, Figure 13-1 shows a bunch of e-mails I ve received, all of which contain viruses. Note that just because they re sitting in my e-mailInbox doesn t mean that my computer is infected by the virus. For the virus totake effect, I would have to open one of the infected attachments. Figure 13-1:All these e-mail messages have viruses attached. Of course, I wouldn t dream of opening any of those e-mail messages or theirattachments. I ll just delete every one of those without so much as taking apeek at them. But this book isn t about me. The question is, What can you doto avoid opening virus-infected e-mail attachments? A simple, free, low-techsolution to the problem is to ask yourself these three questions before youeven consider opening an e-mail attachment: 1.Do I know, personally, who sent this e-mail attachment to me? 2.Was I expecting that person to send me this attachment? 3.Does the e-mail message itself describe what s in the attachment?
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