There are some steps you can take to protect yourself however: The best safeguard is to avoid accessing sensitive websites on public networks i.e. your bank account, email. etc
If you must access such websites, before entering you user name and password, ensure that your connection is encrypted and connected to the real web server. You can do so by verifying that the url begins with an https. HTTPS refers to HTTP over SSL encryption. This means that all communications between your web browser and the web server you are connecting to is encrypted. Anyone sniffing your network traffic will be unable to see what is actually being sent.
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