if you install fedora on a system run this script once and it'll import
the keys you need to use many of the redhat repositories securely.
cut here.
#!/bin/bash
# getkeys script - import keys from redhat and other servers.
rpm --import /usr/share/rhn/RPM-GPG-KEY
rpm --import /usr/share/rhn/RPM-GPG-KEY-fedora
rpm --import http://www.fedora.us/FEDORA-GPG-KEY
rpm --import http://www.fedora.us/FEDORA-LEGACY-GPG-KEY
rpm --import http://rpm.livna.org/RPM-LIVNA-GPG-KEY
rpm --import http://svn.rpmforge.net/svn/trunk/rpms/yum/RPM-GPG-KEY-fedora
rpm --import http://svn.rpmforge.net/svn/trunk/rpms/yum/RPM-GPG-KEY-freshrpms
rpm --import http://freshrpms.net/packages/RPM-GPG-KEY.txt
cut here.
