auth     optional  pam_gnupg.so store-only
session  optional  pam_gnupg.so
>> /etc/pam.d/system-login

allow-preset-passphrase
max-cache-ttl 86400
>> ~/.gnupg/gpg-agent.conf

gpg --full-gen-key

gpg -K --with-keygrip
>> ~/.config/pam-gnupg