SSH

Don't give root keys to environments that can be compromised: SSH key least privilege

Registering a root key into production from an ephemeral, compromisable environment (GPU pod, CI runner, throwaway VM) means that the moment the environment is compromised, production is taken with root. Fix: no root keys on ephemeral environments; remove keys when unused; if needed again, use a non-root user plus a command-restricted key that limits the key to one operation. A reused key is your most critical asset — never build a 'one leak, everything' setup.