Hadmut Danisch wrote:
On Fri, Mar 07, 2003 at 06:54:08PM -0500, David F. Skoll wrote:
I use the following algorithm in CanIt. It is by no means perfect,
but it's pretty good:
- Skip a line starting "Dear "
- Do a SHA1 hash on what's left.
This won't work.
It works for certain classes of spammer. It can be made significantly
better (eg: stripping HTML tags and comments, stripping
non-alphanumerics, not only collapsing whitespace, but _removing_ it),
but it's still trivially bypassable.
<snip>
I actually wrote a very simple perl script that works perfectly in the way
that you want the chksum to work.
The problem was that it classified every newsletter, breaking news alert,
and weather report as spam.
Duplicity checks don't work because there is too much valid duplicity, not
because it cannot be accomplished technically.
Regards,
Damon
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