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Of course, you must be prepared to switch systems if your solution starts becoming
Using "diverse" software is not necessarily "security by obscurity" as another
comment claimed. It would actually be a variant of the biological strategy that has
among other things prevented any single disease from wiping out the human race.
The Warhol worm and other nasties discussed in the recent research paper "How to 0wn
the Internet in your spare time" depend on the existence of large numbers of sites
with identical vulnerable software. Being different protects you from that (and other
indiscriminate attacks). But it does not necessarily protect you from a skilled attacker
who is determined to crack your site in particular.
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