To ensure the system can cryptographically verify base software packages
come from SUSE (and to connect to the SUSE to receive them),
the SUSE GPG key must properly be installed. To install the SUSE GPG
key, run:
$ sudo zypper install suse-build-key
If the system is not connected to the Internet or an RHN Satellite, then
install the SUSE GPG key from trusted media such as the SUSE
installation CD-ROM or DVD. Assuming the disc is mounted in
/media/cdrom, use the following command as the root user to import
it into the keyring:
$ sudo rpm --import /media/cdrom/content.key
or
$ sudo rpm --import /media/cdrom/repodata/repomd.xml.key
Alternatively, the key may be pre-loaded during the SUSE installation. In
such cases, one can use the repository cache files to install the key,
for example by running the following command:
sudo rpm --import /var/cache/zypp/raw/Basesystem_Module_15_SP2_x86_64:SLE-Module-Basesystem15-SP2-Pool/repodata/repomd.xml.key