Who would have known that a fun project (originating from a computer game idea) would end up 50 years later as being the ground work for most modern operating systems? Happy Birthday to UNIX 50 years.
If you want to have extra security for your linux machine besides the usual password. Then get yourself a SoloKey or other hardware U2F key and use that as secondary login. Here I give you the description on how to install and configure everything for using Solokeys with your linux. Enjoy!