[Mimedefang] Image blocking idea
David F. Skoll
dfs at roaringpenguin.com
Thu Apr 20 09:42:04 EDT 2006
WBrown at e1b.org wrote:
> The same can be said for any spam blockling technique: It's effective
> until they work around it.
Except that ratware producers are now seasoned by 4+ years of battle
with anti-spam technology, so they are more likely to think of these
things and implement workarounds quickly.
> How long would it take for spammers to start generating a new graphic for
> each message?
I expect some ratware is already doing that. You don't need a whole
new graphic to defeat hashing; just adding random noise to the
least-significant few bits of each pixel would work fine.
> How much would it slow down the sending for them to do so?
None at all. See my other post: Anti-spam technologists must assume
that spammers have practically unlimited computing power and bandwidth.
Regards,
David.
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