[RC5] special processor for cracking RC5?, was: What if RC5-64 is done

Dennis Lubert plasmahh at gmx.net
Sun Jun 3 11:53:20 EDT 2001

At 02:12 03.06.01 +0200, you wrote:
>Hello Mathieu, cow-friends,
> > On the main page of distributed.net we can read
> > "distributed.net's computing power has grown to
> > become equivalent to that of more than 160000 PII 266Mhz computers
> > working 24 hours a day, 7 days a week, 365 days a year!"
> > I doubt an organization could really build something A LOT stronger
> > than this, able to crack a 64 bits encryption in a year or so ??
>Well, this is just some sort of figment of the mind, but would it be
>possible to build a processor which is optimized for cracking a special
>encryption like RC5-64?

Perhaps u should take a look at the HARDWARE List. They sometimes disucuss 
creation of a FCPGA array, created only for cracking rc5, but afaik they 
have some problems in unrolling the algorithm, so they will not get 1 
key/clock (whats their original aim was). But it seems to be possible to 
create a processor like this which needs only a few clocks/key so if 
someone would build it, we could have something like this deep crack thing 
for DES, but we need much more processors for a high rate I suppose.

>As far as I have learned from this list, the x86 has some good features
>for cracking RC5, especially the rotation-instruction. Well, there should
>be a "dream-system" which supports all instructions needful for cracking,
>so it could work ten (a hundred?) times faster than every known
>(single-)processor on earth.
>And because I'm as much as a fan of the whole
>NSA/CIA/KGB-conspiracy-theory as all of you, I could imagine THEY
>(whoever) has the ability to build such a machine...
>Well, enough of this, let's get back on earth: Are there any instructions
>which could be supported by a processor to increment the cracking-process?
>And how fast could such a processor be?
>And please don't mention the quantum-processor, I know it could crack the
>whole RC5-64 in one second, but I imagine a system which could be build
>with today's abilities... ;)
>cu Chris
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