Re: Analog Hole Bill Would Require Secret Tech No One Can Examine

In article <RuYBf.15947$Jd.11228@xxxxxxxxxxxxxxxxxxxxxxxxxx>,
joseph2k@xxxxxxxxxx says...
> Joerg wrote:

> >> Nobody managed to crack the triple-DES protection on Divx DVDs.
> >>
>
> No silicon is available that will do triple-DES at video rates. Therefore
> triple-DES is used for key management. That key and the encryption
> algorithm MUST be cheap enough for inclusion in consumer equipment (no more
> than $1 in volume). Please checkout Linux Xvid algorithms which are
> purportedly compatible.

4.7GB for a 2-hour DVD is a little over 650kB/sec. 3DES at this
rate is *easy* in hardware these days. With a 650kB/sec data
stream and allowing only one DES round per cycle it works out to
about a 32MHz clock. Ten times that should be a piece of cake even
on an outdated fab. IIRC a single round of DES hardware is about
5-6K gates, so it's a small corner of a chip so multiple rounds per
clock are possible, as well.

--
Keith
.