SD Cards Aren’t As Secure As We Think

TechCrunch

The hardware hacker Bunnie Huang gave a talk at the Chaos Compute Club Congress where he offered some good news and some bad news. The good news? SD cards contain powerful, handy micro controllers that are useful to hackers and hobbyists. The bad news? SD cards are woefully insecure.

In a detailed and readable post, Huang describes the exact problems with Flash memory. In order to reduce the price and increase the storage space, engineers have to fight a never-ending form of internal entropy that slowly but surely scrambles the data on every Flash drive.

Huang writes:

Flash memory is really cheap. So cheap, in fact, that it’s too good to be true. In reality, all flash memory is riddled with defects — without exception. The illusion of a contiguous, reliable storage media is crafted through sophisticated error correction and bad block management functions. This is the result of…

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