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 |