According to Wikipedia, this defacement was a prank by the organizers but it has not been confirmed.
Mail from Jeff Moss to ISN printed below (original): http://www.infosecnews.org/hypermail/0307/7912.html
Mirror of the "defacement": http://web.archive.org/web/20030726160008/http://rubi-con.org/
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Rubi-Con Defaced? 7-22-03 So there I am, 11:25 at night,when I get a call. "Have you see www.rubi-con.org?" they ask. "No, not recently" I say. In a letter on Rubi-Con's home page there is a claim that Rubi-Con and myself have been in some sort of legal battle, and that I somehow have forced Rubi-Con of business. Seeing how this is the first I have heard of it, I am going to assume that Rubi-Con got their web site rooted and defaced by someone trying to stir up trouble in the underground. If they had spent any time looking at defcon.org they would have realized that we have been listing Rubi-Con in our Upcoming Conventions calendar since their first show, and that some of the DEF CON organizers help with Rubi-Con as well as with ToorCon. We support the community, not divide it. To summarize: There has never been any litigation between us. If there had been, it would be public record, etc. Nice hack. Jeff Moss -----BEGIN PGP SIGNATURE----- Version: PGP 8.0.2 - not licensed for commercial use: www.pgp.com iQA/AwUBPx0ETVqBFadmyozQEQK08QCfQOsWdMYXhmmqs+1YfnEtbSreHrwAn2rc NaxWiLYUI6AEZDuH9cIh90vR =cUSr -----END PGP SIGNATURE-----