Hi, as a follow up to a conversation in #centos-devel, I'd like to get input from the list on this issue.
The question is where to point people, and tools like yum, for the centos gpg key used to verify rpm signatures. My opinion is that pointing to the key in /etc/pki/ which gets installed by the centos- release makes the most sense. This is already installed locally on any centos (-5) machine. See ie. http://bugs.centos.org/view.php?id=2419
From a security standpoint, there are issues with either choice. However, if your install media has been compromised, then there would be many other ways to bypass the gpg checks rather than just changing the gpg key from the centos-release package. Pointing to a URL for the gpg key opens up more security issues such as dns poisoning.
-Jeff