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How can you prevent a Man-in-the-middle attack?
Use a transaction counter
Use open Wi-Fi
Only talk with trustworthy people
Use a one-time-password
Use SSL/TLS
Use a challenge-response-protocol
Use a per transaction unique attribute (cryptographic if possible) to counter a replay. Also, use a browser plug-in such as HTTPS Everywhere or ForceTLS. These plug-ins will help you establishing a secure connection whenever the option is available.
Source: http://www.thewindowsclub.com/man-in-the-middle-attack
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