[Yum] Enable checking packages via GPG

The yum meesage show me this:

You have enabled checking of packages via GPG keys. This is a good thing.However, you do not have any GPG public keys installed. You need to downloadthe keys for packages you wish to install and install them.You can do that by running the command: rpm --import public.gpg.key

Don't worry, you only need go to:
/usr/share/doc/centos-release-4
and simply do:
rpm --import RPM-GPG-KEY-centos4

[Yum] Enable checking packages via GPG

The yum meesage show me this:

You have enabled checking of packages via GPG keys. This is a good thing.However, you do not have any GPG public keys installed. You need to downloadthe keys for packages you wish to install and install them.You can do that by running the command: rpm --import public.gpg.key

Don't worry, you only need go to:
/usr/share/doc/centos-release-4
and simply do:
rpm --import RPM-GPG-KEY-centos4