Door keys are not just random indentations on a piece of brass, there are specific plates, every key has a number. So somebody got the master keys for a high-rent apartment complex in that particular area. But a question about the deployment of PKIs revealed that the hackers were actually licking their chops in anticipation. That's going to be a lot of fun. Those are going to be great hacking targets.
Key management is one of the biggest problems.
You've got to generate the keys and get them out there. Most schemes don't take key management into account. People are left to fend for themselves. Generally, mainframe security is terrible-especially in state governments. For example, in one particular state government system, every user had to change their password every month, and it had to be longer than three digits.