RE: A83: Re: Flash App Hacking

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RE: A83: Re: Flash App Hacking


Just thinking, could not something be done like with ROMDUMP, but then 
backwards... :

Person starts APPWRITE program.
Person starts special app transfer link program on PC...
APPWRITE program writes app to flash mem without validating...

Just a speculation of course,

Do I understand correctly that the flsh chip validates the app, and not 
some kind of ROM routine... (which makes the above hardly possible too)

Peter Martijn

-----Original Message-----
From:	Solignac Julien [SMTP:x1cygnus@online.fr]
Sent:	Saturday, September 30, 2000 2:52 PM
To:	assembly-83@lists.ticalc.org
Subject:	A83: Re: Flash App Hacking


>Does anyone know if it is possible to hack the TI-83+ Flash App signing
bizz, so you can make your own apps >w/o TI-Signing
>Since the TI-83+ isn't so capable of doing extremely complicated
no-cracking-possible signing/encrypting >calculations, it might be 
possible.
>I think it would be very useful..., or at least I'd be interested in the
signing process.
>Does anyone know if it would be legal to make your own app-signing program
and distribute it?

Ti uses an extremly hard to crack signing process: MD5 + RSA, just change
one bit in a app and I't wont validate. Sorry for the disillusions but the
only way to hack an app would be to materialy modify your TI-83 Plus so 
that
the flash chip authorises writing. Otherwise you can allways try the 2^128
combinaisons.

Solignac Julien
x1cygnus@xcalc.org
http://xcalc.org

Piracy is a victimless crime, like punching someone in the dark



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