Author Topic: Idea for prime finding....  (Read 13049 times)

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Offline AngelFish

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Re: Idea for prime finding....
« Reply #15 on: November 08, 2010, 12:31:22 am »
So, if i found it I'm assuming you would accuse me of somehow getting it from TI? :P

I'd ask what their system codes were ;D
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Offline Netham45

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Re: Idea for prime finding....
« Reply #16 on: November 08, 2010, 12:35:49 am »
We should find Herb(or whatever the lawyers name was) and beat the codes out of him!
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Offline AngelFish

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Re: Idea for prime finding....
« Reply #17 on: November 08, 2010, 12:55:19 am »
He eats lunch at the Blue Cafe every Tuesday at 1:30 sharp. Just sayin'...
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Offline calc84maniac

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Re: Idea for prime finding....
« Reply #18 on: November 08, 2010, 02:30:49 am »
There is a line between encryption and signing, though.

RSA can be used for encryption, but in this case, it's just used to verify that the OSes haven't been tampered with, or acting as signing them.

iirc, the OSes just have some sort of weird compression on them, no actual encryption.
I think how it worked was that the boot2 was compressed and the OS itself was encrypted. Of course, once Goplat figured out the compression of the boot2 and extracted the binary, it was a relatively simple step to run the OS through the decryption routine in the boot2.
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Offline TIfanx1999

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Re: Idea for prime finding....
« Reply #19 on: November 08, 2010, 09:02:35 am »
I know it's been said before, but I'ma say it again:

It's mathematically impossible to find the primes for these numbers within our lifetimes using current hardware.

The idea of starting now would not work, you'd have barely made a dent by the time that hardware that could do this within a reasonable time exists. Chances are that we'll all be on to the prizm by then anyways.

It'd be less effort to break into TI and steal the keys.

Sounds like a job for the Lobster nation army... :D

Offline willrandship

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Re: Idea for prime finding....
« Reply #20 on: November 08, 2010, 09:16:29 am »
I doubt Herb has a really long hexadecimal number memorized. :P

And unfortunately, the boot2 has its own certificate. If we wanted to (and we had the key) we could simply do a complete format and overwrite the boot2, except that the checker for it is the boot1, which is ROM (not flash ROM either, completely unchangeable)
« Last Edit: November 08, 2010, 09:18:20 am by willrandship »

Offline Goplat

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Re: Idea for prime finding....
« Reply #21 on: November 08, 2010, 02:43:27 pm »
except that the checker for it is the boot1, which is ROM (not flash ROM either, completely unchangeable)
It actually is Flash ROM, and there is code in the diagnostics to re-flash the BOOT1 from a file read from an SD card. But there's no reason you'd ever want to flash it because 1) there would be a major chance of completely bricking your calculator, and 2) unless you have whatever hardware TI uses to connect an SD card reader, only way you could flash it is if you already have the ability to execute your own code, which would mean there's no point.
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