[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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