as of JRS 7.5, the server generates a unique key when it is installed. Key management is described in the security guide. There are ways todo this in earlier versions,but I see they are not well documented. If you can update to 75, that might be the best solution. https://community.jaspersoft.com/documentation/tibco-jasperreports-server-security-guide/v7/key-and-keystore-management