To resolve this key problem in RHEL, I installed the public release key
#rpm –import /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
This allows you to install from the local source.Copy and install all the packages from the RHEL5 DVD’s to a directory to use ‘YUM’ from local repository.
Importing the key as outlined above enabled me to install the packages without getting the following error:
warning: rpmts_HdrFromFdno: Header V3 DSA signature: NOKEY, key ID 37017186.
Note : RHEL DVD’s help me in completing the installation in local server without internet connection.