Looking for logging into the Linux Cert site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Linux Cert site. After that you can login as usual with your login credentials.
https://www.thomas-krenn.com/de/wiki/SSH_Key_Login
https://www.thomas-krenn.com/de/wiki/OpenSSH_Public_Key_Authentifizierung_unter_Ubuntu
https://training.linuxfoundation.org/certification/
https://www.techgrube.de/tutorials/ssh-login-mit-public-private-key-authentifizierung
https://www.digitalocean.com/community/tutorials/how-to-configure-ssh-key-based-authentication-on-a-linux-server
http://www.codewrecks.com/blog/index.php/2015/10/10/using-certificate-to-connect-via-ssh-to-your-linux-machine/
https://www.dfn-cert.de/informationen/nachsehen-linux.html
https://serverfault.com/questions/62496/ssl-certificate-location-on-unix-linux
https://wiki.student.uni-goettingen.de/support/wlan/eduroam_linux
https://www.luis.uni-hannover.de/pki-linux-server-cert.html
http://www.linuxproblem.org/art_9.html
https://www.urz.uni-heidelberg.de/de/eduroam-unter-linux-einrichten
https://chromium.googlesource.com/chromium/src/%2B/HEAD/docs/linux_cert_management.md