I converted my xfce debian system into kicksecure by installing the kicksecure-cli. Now, when I start gpg, it warns me, that my home directory has unsecure permissions.
The permissions look like this:
user@host:/home$ ls -l
total 4
drwxr-x— 16 user user 4096 Jun 22 14:46 user
In Debian (based) distribution(s) the linux user user is default member of a system group with the same name as the linux user account. That is really old. Called usergroup or so.