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Posted by Dotan Cohen on 10/19/18 11:24
On 8/18/05, Richard Lynch <ceo@l-i-e.com> wrote:
> On Mon, August 15, 2005 4:57 pm, Dotan Cohen wrote:
> > I have a form that my visitors can email me from. Some jerk is trying
> > to fool the mail() function into sending his spam, and I got this
> > today:
>
> Put a CAPTCHA on the form.
>
> The jerk is probably not actually using your form, but a script that
> walks the net looking for forms that have name="xyz" where xyz is
> something that looks like a contact form or the URL has "contact" in
> it or...
>
> Anyway, if CAPTCHA doesn't do it, you can also put in a throttle to
> only accept N posts from IP a.b.c.d within X hours.
>
> Not completely foolproof, but what spammer will bother to change his
> IP address to send out junk when there are so many open relays and
> wide-open email forms out there?
>
> And, yeah, if more than N people who work at "Big Company" try to post
> within X hours, you'll lock them out, but how likely is that?
>
> Like Music?
> http://l-i-e.com/artists.htm
>
I don't really like CAPTCHA's. I'm filtering the content now, which is
in my opinion better anyway. In my university one of the computer
science projects (for an assignment!) is to break CAPTCHA's. Jpg-> bmp
and once it's a bmp the white noise and lines can be removed (think
photoshop filters), then OCR software extracts the words. It even
works on squiggly text with the right fonts installed in the OCR. Not
100%, but it is easier for the computer to decipher than a handicapped
person, or a text browser. And I don't want to lock those out.
Dotan
http://lyricslist.com/lyrics/artist_albums/137/crosby_stills_and_nash.php
Crosby, Stills And Nash Song Lyrics
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