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Security and Cheap Complexity

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I’ve been saying that complexity is the worst enemy of security for a long time now. (Here’s me in 1999.) And it’s been true for a long time.

In 2018, Thomas Dullien of Google’s Project Zero talked about “cheap complexity.” Andrew Appel summarizes:

The anomaly of cheap complexity. For most of human history, a more complex device was more expensive to build than a simpler device. This is not the case in modern computing. It is often more cost-effective to take a very complicated device, and make it simulate simplicity, than to make a simpler device. This is because of economies of scale: complex general-purpose CPUs are cheap. On the other hand, custom-designed, …

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