Q: The secured chips usually just deny access by blowing a fuse on programming. Sometimes they do something smarter, like just denying all reads but allowing writes. In some cases, though, it will just store a key and response, and only allow access if the correct response is provided for the given key.
A: They can do much more than that to obsure code on a chip, resist differential power analysis, scramble data, etc. If you blow a programming fuse, someone can unencapsulate an MCU and probe the memory. You want more than a blown fuse link in MCUs used in casino chips, or bank smart cards,for example
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