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Install GNU Privacy Guard from OpenPGP and have generated and signed PGP keys. Please, refer Release Signing about PGP public key cryptography. The document contains basic information about release signing and contains link to various resources about PGP public key cryptography and how to use GNU Privacy Guard to generate and sign the PGP keykeys.

Briefly,

1. install GNU Privacy Guard
   for Red Hat based systems (Fedora, Centos OS, Red Hat Enterprise Linux) simply use yum to install gpg:

   No Format
   sudo yum install gnupg

2. generate your master key and sub-key following steps provided here
3. sign the keys

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