Rockbox mail archive
Subject: Re: Gmini Firmware question
From: Jimmy Moore (jimmy_at_axod.net)
Archos doing it properly?? get real!
The firmware format has already been worked out (By some strange person
called DoggerMoore). It is the same compression and encryption
algorithms as the jbmm, av100 and av300 firmwares.
Unfortunately Archos will not let anyone release it...
The thing to remember if you want to get access to it, is 'the people
who wrote it are fools'. Look in a book on cryptography. Look at the
first algorithm described. Look in a beginners book on compression. Look
at the first algorithm described. Simple. Have fun...
On Tue, 2003-12-30 at 07:52, [IDC]Dragon wrote:
> > Guessing
> > the signing algorithm might be tricky as would be the cracking of the key
> > used to sign the firmware. Having access to the gmini's ROM would be
> > for this task but I don't know yet if it's physically feasible.
> Accessing the ROM is very likely to be feasible, but may not help at all. If
> Archos "did it properly", they use real cryptography and a public/private
> key pair. The public key may be in the box's ROM, but you need the private key
> to author your own firmware. And this is what you're not gonna get...
> So, things can be really bulletproofed, but what usually stands against it
> - the runtime for a serious decryption, large number arithmetics is slow on
> "regular" embedded processors
> - implementation flaws that allow you to feed code some other way, thus
> bypassing the whole security mechanism, see XBox hacking.
Jimmy Moore <jimmy_at_axod.net>
Page was last modified "Jan 10 2012" The Rockbox Crew