gpg: can't handle public key algorithm 18

[Konstantin Ryabitsev]

On Mon, Apr 17, 2023 at 03:22:42PM +0200, Werner Koch via Gnupg-users wrote:
> >> > gpg (GnuPG) 2.0.22
> 
> That version reached end-of-life more than 5 years ago.  Don't use it.

If you need a newer version of GnuPG for RHEL7 systems, you can install
gnupg24-static from this COPR:

https://copr.fedorainfracloud.org/coprs/icon/lfit/packages/

-K