Link: https://softwaresupport.hpe.com/group/softwaresupport/search-result/-/facetsearch/document/KM02707977 Digital signature verification of RPM package This procedure is necessary for the digital signature verification of RPM package to make sure the file has not been tampered with and the code was indeed signed by the trusted entity (Hewlett Packard Enterprise). If this is not done, you may see NOKEY warning during the installation of the ALM Octane application: warning: octane-onprem-12.53.xx.xx.rpm: Header V3 RSA/SHA1 Signature, key ID b564a643: NOKEY Solution : If user sees NOKEY warning during the RPM package installation, they need to follow procedure on this page for the missing key. In the example above, key ID is b564a643. Here is the summary of steps: Download the keys (or use attached ) Extract the missing key (or use attached ) Import the missing key rpm --import /path_to_the_key/B564a643.pub Valid...