Public Key issue while installing rpm through yum

Public Key issue while installing rpm through yum.

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1. Check keys.
  
    find / -name "*GPG*"

  - Will get answers like below

    /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
    /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-former
    /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-rhx
    /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-auxiliary
    /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-beta


2. Go to the /etc/pki/rpm-gpg/
    # cd /etc/pki/rpm-gpg/

3. type the below command.
   # rpm --import *GPG*

 The above command wont be give any kind of output.