Jon Titus
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Re: Part II: Picking the Right MCU for Your Application
Jon Titus   1/17/2012 4:05:47 PM
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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