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Unrealistic, perhaps, but what about adding another layer of security requiring the use of one of those changing passkey card thingies that you can't get into the system without? My sister works for an international company that moves a lot of money (she occasionally talked about accounting errors that she had to chase down involving a couple of million dollars as though it was like my checkbook being off by 23 cents) around that has those things.
Probably cheaper than having the whole system brought down around your ears.
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