In a perfect world, everyone would understand that sending user names, passwords and sensitive financial data via an unencrypted public network is a bad idea.
Free WiFi is now a given in many public spaces such as coffee shops, airports and hotel lobbies. Most people don’t think twice about quickly accessing an open network, even to check a bank balance or pay a bill. But appearances can be deceiving, and not all networks are legitimate. It is now common to have skilled fraudsters, or even casual hackers, set up dummy networks that ensnare unsuspecting patrons and capture sensitive information, such as banking passwords. Criminals sitting next to you, or in the parking lot 100’s of feet away, can intercept data—and there is no way to pick them out of a crowd.
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Source: FICO Banking Analytics Blog