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From the Schneier on Security blog

Developers are starting to talk about the software-defined car.

For decades, features have accumulated like cruft in new vehicles: a box here to control the antilock brakes, a module there to run the cruise control radar, and so on. Now engineers and designers are rationalizing the way they go about building new models, taking advantage of much more powerful hardware to consolidate all those discrete functions into a small number of domain controllers.

The behavior of new cars is increasingly defined by software, too. This is merely the progression of a trend that began at the end of the 1970s with the introduction of the first electronic engine control units; today, code controls a car’s engine and transmission (or its electric motors and battery pack), the steering, brakes, suspension, interior and exterior lighting, and more, depending on how new (and how expensive) it is. And those systems are being leveraged for convenience or safety features like adaptive cruise control, lane keeping, remote parking, and so on...