SSL apostate Ian G. refers to an article on estimation of loss due to a privacy breach.
I think we are measuring the wrong thing, and operating on these assumptions is dangerous.
From the article, a Forrester analyst says:
"After calculating the expenses of legal fees, call centers, lost employee productivity, regulatory fines, stock plummets, and customer losses, it can be dizzying, if not impossible, to come up with a true number."The $90 - $305 range smacks of too much precision and not enough accuracy. Only software project managers can get away with ranges like that. These numbers are more harmful that worthwhile. Most of these factors are not driven by record count (legal fees, stock plummets or lost productivity). Record specific costs are generally lower (call center and postage - and if you lose enough records, you don't even have to mail notices). So let's just call it BTUs per furlong and call it a day. And I don't think "customer losses" is as important in assessing the risk as "losses to customer."
The next Forrester quote underlines the problem I have with the general corporate thinking about privacy breaches:
"Previously, when a company had a data breach, a response team would fix the problem and test the mitigation, then the company would resume normal activities. Now we have to spend time on public relations efforts, as well as assuring both customers and auditors that new processes are in place to guard against such breaches in the future."The reason you could get away with just fixing it and moving on was because the company did lose anything it owned. What it lost was owned by its customers. Losing one bit of highly sensitive data about one litigious customer could cause more damage that a dozen laptops filled with the SSNs of 10 million people.
It's the "loss to the customer" that will drive your high dollar PR and legal efforts, which have scale, and can dwarf your call center and postage costs in an afternoon.
I'd like to take the data, rehash it according to type of breach, sensitivity of data and litigiousness of customer. Then I think you'd start on the road to a meaningful metric.