User:Xxc3nsoredxx

YubiKey
Instructions for authenticating with PAM using a YubiKey in U2F mode. Can be used to create single- and multi-factor authentication schemes on Linux. Supports YubiKey Edge(-n), NEO(-n), and 4 series and later devices. Currently does not work for remote login such as SSH.

PAM securetty
Instructions for using PAM to restrict the  is able to authenticate on. The relevant PAM module is.