This excerpt is frightening: > About half of the company's 500,000 servers run on outdated software that does not support basic security features such as encryption for stored data or regular security updates by vendors
If you're trying to prevent an actor who has gained a foothold on a box/network from seeing plaintext data that is actually in use by the actual production system at that very moment, you're looking for a much stronger type of control - probably some sort of client-side encryption or obfuscation/tokenization