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To an extent yes, but secure elements are supposed to have actual security features (security meshes, voltage/clock monitoring, etc) that typical micros do not.
![Adam [he/him]](https://pbs.twimg.com/profile_images/2328235588/mky7liyb93paqco9cfuk_normal.gif)
But anybody who signed the NDA can't tell others, because they have signed not to do it?
Exactly
The biggest issue AFAIK is that all good hardware countermeasures are patented, even obvious ones. I am afraid one cannot build an open source secure element without infringing on a bunch of them.
Surely some of those have expired by now? It's 2020, SEs existed in the 90s.
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