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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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Writing an library to shiftregister.

It seems stupid cause there are many cool libraries for shift registers, but for me i just need to try from my own one. It dosent' matter if the code is long or messy.. when i first trying to write this i separated all the parts. Which means a separate part for shift clock, latch clock and data, this way i wrote the code and it was more than 80 lines but later it was cut down to 30 something lines.
Now i have reach to my destination, it was to make an own library to operate a shift register. I think this way will make you understand how it works. I hope this will be a great idea for electronics hobbyists out there.
If you are new to shift register i can just give an hint. Its basically D-type Flip Flops, when serial data is inserted to it. it will out put the parallel data. Normally used to expand I/O lines.

Datasheet for 74LS595

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