[RC5] rc5 cracker

Rob Pinkerton rpinkert at cadvision.com
Wed Jan 6 16:19:00 EST 1999


If you want to donate money to distributed.net go to eyegive.com they will
give some of the money that they make to distributed.net when you click on
their ads...  It only takes about 2 minutes a day and you can make about
60$/year for your charity...  just think what would happen if 100000 people
all did that...

At 01:01 PM 1/6/99 -0600, you wrote:
>Is anyone interested in building a EFF-type deep cracker (er whatever)
>for rc5 or DES. (specifically for rc5)? Is it even possible?
>
>I'm quite certain many if not most of the 100,000 d.net participants
>would be interested in donating a few bucks towards it. I know I would
>be. It could very possibly double our keyrate. If not it would very
>signifigantly increase it.
>
>jadin Hanson
>like programming? try www.robotbattle.com
>Free Kevin!
>___________________________________________________________________
>You don't need to buy Internet access to use free Internet e-mail.
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::

RC4 is a symmetric stream cipher and is fairly fast. It allows keys up to 
2048 bits in length. It uses an internal table of 256 bytes which is seeded 
with your key, so you can use smaller key sizes too. If the Wassenaar 
Arrangement is passes into law it would be against the law to use this as 
my .signature:

#!/usr/local/bin/perl -0777-- -export-a-crypto-system-sig -RC4-3-lines-PERL
@k=unpack('C*',pack('H*',shift));for(@t=@s=0..255){$y=($k[$_%@k]+$s[$x=$_
]+$y)%256;&S}$x=$y=0;for(unpack('C*',<>)){$x++;$y=($s[$x%=256]+$y)%256;
&S;print pack(C,$_^=$s[($s[$x]+$s[$y])%256])}sub S{@s[$x,$y]=@s[$y,$x]}

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