No Authentication mode has no security. Visual Studio sends the current username to the remote debugger, but this information ...

No Authentication mode has no security. Visual Studio sends the current username
        to the remote debugger, but this information is not verified. No Authentication
        mode should never be used on a network that may have hostile traffic. When using
        no authentication mode, it is recommended to use firewall settings to restrict which
        computers are able to connect to the remote debugger. Even with strong firewall
        settings, no authentication mode offers significantly weaker protection than Windows
        Authentication mode. So it is recommended to use Windows Authentication mode whenever
        possible.