RPM packages are published on Bintray repository. All packages are signed using the key 562CBC1C (fingerprint: 0CD5 AC59 DE5C 5A8E 0EE1 3849 3D99 BB18 562C BC1C)
First install rpm release package:
yum install install https://dl.bintray.com/cert-bdf/rpm/thehive-project-release-1.0.0-3.noarch.rpm
This will install TheHive Project's repository in /etc/yum.repos.d/thehive-rpm.repo and the GPG public key in
/etc/pki/rpm-gpg/GPG-TheHive-Project.
Then you will able to install Cortex package using yum:
yum install cortex
Once the package is installed, please configure Cortex.