[caf]

Embedding it in the circuitry isn't that complicated - remember, it's only 256 bits you have to embed, which for example could be stored in 256 fusible links.

[andromeduck]

If it's in fusible links, which IMO is very likely, wouldn't that mean you could read it back the same way you wrote it?

Maybe another HW key is required to do so.

[belovedeagle]

> wouldn't that mean you could read it back the same way you wrote it

Not if there's a write-permit fuse as well =)

[andromeduck]

Good point but isn't blowing a fuse detectable with x-rays?