Schneier on Security: REAL ID: "I've already written about national IDs. I've written about the fallacies of identification as a security tool. I'm not going to repeat myself here, and I urge everyone who is interested to read those two essays (and even this older essay). A national ID is a lousy security trade-off, and everyone needs to understand why.

Aside from those generalities, there are specifics about REAL ID that make for bad security.

The REAL ID Act requires driver's licenses to include a 'common machine-readable technology.' This will, of course, make identity theft easier. Assume that this information will be collected by bars and other businesses, and that it will be resold to companies like ChoicePoint and Acxiom. It actually doesn't matter how well the states and federal government protect the data on driver's licenses, as there will be parallel commercial databases with the same information."

(Via Schneier on Security.)