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How to setup 2FA On Linux SSH Login

  This is a simple setup guide to enabling Two Factor Authentication (2FA) on Linux SSH login. I this article I wont go deep into setup and issues that I have faced when implementing this. First thing is first Update your system first. I have used Ubuntu 20.04 and it is always up to date. To enable 2FA you need to install google authenticator modules sudo apt install libpam-google-authenticator Configuration for PAM and SSHD Add the the following line to /etc/pam.d/sshd and After adding this line please restart the sshd services.  auth required pam_google_authenticator.so Go to /etc/ssh/sshd_config and check if the following line exist. Default value will be "no" so change it to "yes" to activate.  ChallengeResponseAuthentication yes Configuration for Authenticator In the terminal run google authenticator command It will ask few things to acknowledge by user. Details you can see from the below video. Once this part is done you are ready to use the 2FA in ubuntu. T
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RF Communication - END

Today i did some tests with the RX and TX circuits. First thing was to test the range or distance of it. Distance is quite good, cause i can roam around my home without any data loss. Theoretically the distance is 200 feet without any obstacles. Transmitter keep on sending "K" to the receiver and from the receiver side i have connected to a display and it displays if the connection loss, if data is not valid and the received data.

The purpose of this was to design a data gathering circuit. Which means you left your garage door sensor or the sensors in farm which detects soil temperature and everything to trigger the water sprayer to spray water.. all these actions can be logged from remote computer or a command center. I think this will be a cool thing and hope the example understand you what it is capable of doing.

Finally i manage to get a camera and some shots was taken and if you want to see more see flicker....enjoy the view..


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