I wish someone would write a "virus" that is actually a self-spreading antivirus. Wouldn't that be something? Patrick Price West Virginia University Valdis Kletnieks wrote: >On Wed, 09 Oct 2002 04:42:41 +0200, Eric Thomas <[log in to unmask]> said: > >>we had to work with. The fact that it still catches viruses even when behind a >>central e-mail scanner that is supposed to stop all viruses shows that all this >>work was not for nothing. >> > >Somewhat off topic, but Fred Cohen (the same guy who came up with the concept >of a virus) showed that stopping *ALL* viruses is equivalent to the Turing >Halting Problem, and thus fundamentally impossible. > >http://www.all.net/books/virus/index.html > >Stopping 99.98% of viruses isn't too hard - but stopping ALL of them is >impossible.. Anybody who says it's doable is obviously a salesman. ;) >