No, but wireless networks are not unique in this respect; on all shared networks, whether wired or wireless, users can potentially eavesdrop on each other's data, though it is not usually likely that they will. If you are transferring confidential information (passwords, credit card numbers, online banking information, health data and so on) you are strongly encouraged to use secure web sites (SSL) or other techniques (SSH, VPN) to safeguard your confidentiality. The library cannot ensure the privacy of information you transfer over the wireless network.
We can assure you that connecting your computer to the Internet via a wireless network does not increase your risk of exposure to viruses and other such risks. Wireless hotspots do not produce viruses, which are most often transmitted as attachments to email. It is strongly recommended that all users install and run a virus protection program.
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