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It sounds like it is built into hardware with newer iPhones containing the secure enclave, but not for an older phone like the iPhone 5C.



It's not really built into ‘hardware’, it's enforced by the Secure Enclave, which is software-based and accepts software updates signed by Apple. It's secure against kernel exploits and third-parties, but not against Apple.


I'm really interested to know more about this. Does TouchId secure enclave really enforce the password attempt limits?



Its really a pretty impressive design. Android phones are lacking here.




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