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Author Topic: Bypassing TI-Nspire RSA signatures now possible?  (Read 33625 times)

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Offline Munchor

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Re: Bypassing TI-Nspire RSA signatures now possible?
« Reply #90 on: April 13, 2011, 07:56:08 am »
Quote from: Lionel Debroux on April 13, 2011, 07:54:53 am
Indeed, it's so far beyond the state of the art. TF could yield something, but with hopelessly remote chances of success.
However, don't forget that we do have arbitrary code execution on OS 1.1 to 2.1, which enables launching other OS without installing them ("RunOS") :)

2048 bits :( Someone said, I totally have to second, "Bypassing it has gone from impossible to impossible".
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Offline Jim Bauwens

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Re: Bypassing TI-Nspire RSA signatures now possible?
« Reply #91 on: April 13, 2011, 11:00:34 am »
Correct me if I'm wrong, but I think that the size of the RSA signature doesn't make that you can't bypass it...
Bypassing the RSA signature makes that you don't need the RSA signature to run code.

(I hope I'm not making a fool from myself)
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Offline BrownyTCat

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Re: Bypassing TI-Nspire RSA signatures now possible?
« Reply #92 on: April 13, 2011, 11:04:47 am »
Algorithms? Ack, I hate how protective TI is- whilst they barely make any use of the ARM processor we spent $100 on.
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Offline mikehill2003

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Re: Bypassing TI-Nspire RSA signatures now possible?
« Reply #93 on: April 13, 2011, 12:40:17 pm »
Quote from: jimbauwens on April 13, 2011, 11:00:34 am
Correct me if I'm wrong, but I think that the size of the RSA signature doesn't make that you can't bypass it...
Bypassing the RSA signature makes that you don't need the RSA signature to run code.

(I hope I'm not making a fool from myself)
Completely correct. It's not any less possible for us to crack 2048-bit then it is for us to crack 1024-bit RSA. It's more likely to rain frogs then it is for us to factor even the 1024-bit RSA keys. That's the beauty of RunOS/OSLauncher, it bypasses RSA completely.(well, except for installing and then rebooting)
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