S Farhad Manjoo answers your questions on Wi-Fi security, proxy servers, and Google Chat contact confusion. - By Farhad Manjoo. If you've got a burning tech problem you want solved, please send a note to farhad.manjoo@slate.com, with "I've got a tech question! " as the subject line. (Your question may be edited.) You can also read previous "Dear Farhad"columns. I often find myself using my computer on public Wi-Fi networks—at hotels, libraries, coffee shops, and so on. What is and what isn't safe to do online while on these networks? Can I log into my e-mail? My credit card account? You're right to worry about browsing in public. We got a very public demonstration of this danger just last month. Butler's program takes advantage of the fact that HTTP, the protocol over which Web traffic travels, is public—it doesn't hide or encrypt the traffic between you and the Web servers you visit.
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