[A83] Re: DS Thread Extended onto this list
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[A83] Re: DS Thread Extended onto this list
Let's ask distributed.net!
> (Lurk mode off :)
>
> >(See, to emulate the restriction, you'd have to know how to check for
> it,
> >thus how to break it . . . )
>
> Not necesarrily. Actually checing to see if the os image is valid is
> probably pretty easy. I assume the TI-83 does it in software, which means
>
> both that VTI already checks the images (by vitrue of emulating the
> calculator), and also anyone clever as disassembly could figure out how it
>
> works. It's actually signing an OS image that's a bitch.
>
> I assume (though I'm not sure) that the signing system is a variation of
> very well known and understood public-key encryption. TI signes their OS
> with a secret, private-key. The OS can then be verified using a
> public-key
> that can be stored in the TI-83 ROM. Because of some very complicated
> math
> having to do with number theory, the public key can be calculated using
> the
> private key, but not the other way around. This is the way most digital
> content is securely signed these days.
>
> Thus, even though you can check to see if data is correctly signed, you
> have
> no way of actually creating signed data yourself (without years of CPU
> time
> spend brute-forcing the crypto).
>
>
> Stupid like a fox!
> Look ma, I'm an artist: http://aaronstj.deviantart.com
>
>
>
>
> _________________________________________________________________
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>
>
--
Groeten,
Ronald Teune @School
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