[rc5] RC5 Chips?

Sean McPherson sean at ntr.net
Fri Oct 31 18:49:42 EST 1997

Yep, the idea was actually the basis for several papers that were
published right after the DES standards were being set; even then, people
thought they were too easy to defeat. A little scrounging on altavista
will probably turn them up. I do recall that if you could sink a few tens
of millions of dollars into the project, you could burn enough ASIC chips
to crack 40 bit keys in less than a second, and if the machine was
operated 24/7 it would be able to continuously crack keys based on 56 bit
des in 38 seconds all day every day. I'll see if I don't have a few of
them stored away in postscript somewhere.

Sean McPherson
sean at ntr.net
Network Operations Technician 
Information Systems
ntr.net Corporation

On 31 Oct 1997, Douglas Bitting wrote:

> OK, someone must have already thought of this, 'cuz I'm not terribly
> original...
> How hard would it be to fab a general RC5 chip which could chew through ~1
> key/clock? (imagine a chip that chews through 500Mkeys/sec).  Throw that
> chip (or a few) on a PCI card, write a driver, and hook that up to a client,
> and chew through something on order of N blocks per sec. per chip? (Where N
> is dependent upon clock speed and number of chips on a card).
> Obviously, this gets slightly beyond the "free, idle CPU cycles", but still
> would fall under the "distributed" effort.  This particular techno-geek
> finds the idea compelling... :-)
> Anyone thought this through beyond the wild fantasy idea stage?
> --Doug
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