Subject: Re: SETI or RC5
To: Bjoern Labitzke <firstname.lastname@example.org>
From: Perry E. Metzger <email@example.com>
Date: 06/30/1999 19:12:46
Bjoern Labitzke <firstname.lastname@example.org> writes:
> * Perry E. Metzger (email@example.com) [990701 00:44]:
> > Not really. Everyone pretty much knows how many CPU cycles cracking
> > RC5 of a particular depth requires, and frankly, all this does is help
> > RSA DSI's marketing department. Sorry to be a party pooper, but RC5
> > cracking is damn useless. It was one thing to show DES could be
> > cracked, but showing large key RC5 requires half a year of heavy work
> > from hundreds of thousands of machines isn't exactly a help.
> Well, it IS usefull for some applications. I liked the examples on the
> RC5-mailing list. Consider e.g. the recipe for Coca Cola. Even if it takes
> you a year or two to decrypt it, that would matter.
Are people working on cracking the coca cola keys? No. They're working
on cracking random keys as "challenges" -- i.e. makework.
The RC5 people know how many keys they can check per second. There is
no challenge here -- you can figure out how long this makework takes
by multiplying. Big Deal.
OTOH, the guys at SETI@HOME have a *real* task. They have enormous
amounts of data to process, and they *really* need the CPU time. This
isn't some "the answer is sitting in a sealed envelope in a vault"
type of situation.