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Can we erase secure enclave to re-pair touch id?

Okay. I am sick of this whole "touch id is paired to the logic board and blah blah blah only the magical demigods at apple can replace it..."

This is ridiculous.

I'm asking: You know how the a7 chip only accepts a touch id module that has one (secret) serial number? Well, First of all, which part of the a7 chip has this serial number and does the checking to see if your home button matches it, and second, could we find a way to not try to read this secret key from this part of the chip (apple probably has security guards against this, so this probably wont work), but actually WIPE this area of the chip completely clean? It may be impossible to read from it, but it shouldn't be impossible to wipe it.

Then of course, we have the issue of trying to code another "expected" serial number back in, but we'll cross that bridge when we come to it.

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Ist dies eine gute Frage?

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I'm sorry I have another question, but I do. could I get a qualcomm 820 chip and have a professional BGA solder it onto the board? I'm sorry if this question is stupid, but I'm 14 and don't have a degree in this stuff.

Then I could program a key myself, and since they're both armv8, it might work right?

wrong?

ridiculous question?

von

No. iPhone SoC pin layout is custom designed, not standard ones, so you can't swap if for other models. It's not like a PC CPU that uses standard sockets and singling protocols. Also iOS will not boot on non-Apple CPUs.

von

Wow. thank you so much. Can you read from the touch id efuses without decapping? sorry, alternate ifixit id

von

why do you need 2 IDs?

von

No, nobody has figured out how, that's why it's called a "secure" system.

von

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People are smarter than you, what you can think of, people have already been trying a long time. Wishful thinking gets you nowhere.

Back to the topic. It would be reasonable to believe the keys in secure enclave are implemented using e-fuses, which are physically one-time programmable. Once you program the key and set the lock bit, the bootrom reads the lock bit and enters secure boot mode, disables all external debug/test interfaces to protect the secrecy and integrity of keys. You cannot access the secure module because all unauthenticated operations are simply rejected.

It may be possible to hack into the button sensors and find a way to program blank buttons straight out of factory, which I believe is Apple's method to repair Touch ID. They have the software to sign secure commands to enable secure enclave to invoke factory pairing again, which reads the key from the e-fuses and write to blank Touch ID buttons.

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Tom Chai, please don't say "people are smarter than you". Whether it is true or not, it hurts my feelings.

von

It hurts your feelings? What?

If I am ever the smartest person in the room, I am in the wrong room.

von

The thing that has been, it is that which shall be; and that which is done is that which shall be done: and there is no new thing under the sun. Ecclesiastes 1:9

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@mayer did you get this figured out yet? I would like an answer by 5PM Eastern.

von

Trump will fix this Touch ID issue, MAGA

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OK go ahead and do it.

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this aint helpful.

von

Sure it is.

We get people like you all the time. They come on here and tell those of us with skills what we should do. Well most of us want no part of issues with ethical or legal questions. its just not worth it. Plus...what is the reward? Getting more $30 home button jobs? That's not worth the possible legal problems.

Log off the computer. Go learn how to do these things. Burn your fingers. Fry some boards. Find out just how hard it can be to do what it is you are asking others to do. Then come back and tell us what to do.

I'll be here waiting.

von

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Earl Fechter wird auf ewig dankbar sein.
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