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Rif: RE: Protecting firmware in 5680x

Started by Unknown October 14, 2002

Ok, I found another that using DS2432!
Which is code size to decode DS2432 information ?

P.S. DS2432 seems expensive (for my applicaton) (around 3.9 euro). Regards,
Giuliano
Simon Lightbody

<Simon.Lightbody@ Per: "'"
<>,
pwrm.com>

Cc:

11/10/02 16.55 Oggetto: RE: [motoroladsp]
Protecting firmware in 5680x We use this part for this purpose. Apart from the normal problems with
Maxim, I haven't heard any specific problems getting this part.

Of course, this is not as good a solution as if Motorola had provided some
security bits in their part.

-----Original Message-----
From: [mailto:]
Sent: October 11, 2002 5:56 AM
To:
Subject: [motoroladsp] Protecting firmware in 5680x In order to avoid that anyone can clone my product, I ask you if is there
any possibility or idea to protect firmware when my product is delivered.
Are you sensible to this problem ?
I'm evaluationg MAXIM DS2432 but (it seems difficult to obtains)
Thanak you
Giuliano _____________________________________
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I was reading the DS2432 data sheet and several white papers from
Maxim/Dallas Semiconductor about their 1-Wire security devices.

It fairly explicitly states at the end of one of the white papers
(http://www.maxim-ic.com/appnotes.cfm/appnote_number/1098) that in
order to preserve the security of the system from physcial attacks,
the reading of the firmware in the SCU (service control unit -
DSP56F8xx in this case) needs to be prevented.

Since the 56F8xx family does not provide any internal electrical
security, how can the use of the DS2432 provide any security, much
less peace of mind? It would seem that it would only make the
reverse engineering of the 56F8xx code marginally more difficult.

How can the expense of 3.9 euros be justified if the device cannot,
by itself, provide any significant or tangible security?

--david

--- In motoroladsp@y..., giuliano.to@q... wrote:
>
> Ok, I found another that using DS2432!
> Which is code size to decode DS2432 information ?
>
> P.S. DS2432 seems expensive (for my applicaton) (around 3.9 euro). > Regards,
> Giuliano
>

>Simon Lightbody
><Simon.Lightbody@
>Per: "'giuliano.to@q...'" <giuliano.to@q...>,
> pwrm.com>
> motoroladsp@y...
>Cc:
> 11/10/02 16.55
>Oggetto: RE: [motoroladsp] Protecting firmware in 5680x > We use this part for this purpose. Apart from the normal problems
with
> Maxim, I haven't heard any specific problems getting this part.
>
> Of course, this is not as good a solution as if Motorola had
provided some
> security bits in their part.
>
> -----Original Message-----
> From: giuliano.to@q... [mailto:giuliano.to@q...]
> Sent: October 11, 2002 5:56 AM
> To: motoroladsp@y...
> Subject: [motoroladsp] Protecting firmware in 5680x > In order to avoid that anyone can clone my product, I ask you if is
there
> any possibility or idea to protect firmware when my product is
delivered.
> Are you sensible to this problem ?
> I'm evaluationg MAXIM DS2432 but (it seems difficult to obtains)
> Thanak you
> Giuliano