[Cryptography] Of crypto and the iPhone
Dave Horsfall
dave at horsfall.org
Fri Dec 3 12:41:03 EST 2021
First, the back-story: the battery in my iPhone finally died; the culprit
was the QR scanner which I have to use practically each day :-( I'll
ignore the socio-political implications and just deal with the crypto
stuff.
So, me being me I decided to replace it myself rather than send it to a
dealer; seemed easy enough, right? Quite a number of videos on the 'net
explaining the process, step by step.
Well, in the process I managed to damage one of those flimsy cables that
abounded within because the digitiser no longer worked; they are really
fragile.
So, a new screen was called for; no problemo, and they are readily
available; this is where the brown stuff hit the fan... The fingerprint
ID was as dead as a dodo (not even being seen by iOS), but the home button
still worked; odd, because they share the same cable.
To cut a long story short, it seems that the screen and body are bonded
together like Siamese twins with a cryptographic exchange, making screen
replacement all but impossible without arcane incantations and for all I
know the sacrifice of a goat.
So, does anyone have any details of this crypto mechanism? Not one video
mentioned it, and neither did the local Apple dealer; I understand that
it's probably not possible to crack, but I'd like to know how it works all
the same.
I insist upon the "right to repair"...
Thanks.
-- Dave
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