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About your statement that stealing EC2's key file would be useless.

I just tested moving my EC2 key file to a different machine, then I tried connecting ( ssh -i keyfile.pem ) to my EC2 instance using it from that other machine, and it worked without problems.
This confirms that If someone steals my key file, they can successfully use it.

I would like to know If there's something I need to do to prevent this from appening..??