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Assume that you want to login your Gmail account on your friend's laptop and you are doubt if he installed a keylogger on his computer. How you can be sure if there is any key logger installed or not?

Ebrahim Ghasemi
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    possible duplicate of [Defence Against Keyboard Keylogger](http://security.stackexchange.com/questions/44268/defence-against-keyboard-keylogger) – Ulkoma Aug 07 '15 at 12:55
  • Not really @Ulkoma. The question is different since they were talking about physical keyloggers whereas here the question broader. –  Aug 07 '15 at 13:30

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I guess it would require too much effort and still you would not be 100% sure.

  • Have a reliable anti malware with the latest update perform a deep scan to look for it.
  • If you are very well experience with the OS' processes, take a look to see if any unknown process is currently running.
  • Check the connected USB devices to the computer. Two keyboards are a indication

What could help you:

  • Use a system virtual keyboard to type in your password.