Re: [PHP] Alternative/Addition to using a CAPTCHA

On 3/31/07, Tijnema ! <tijnema@xxxxxxxxx> wrote:
On 3/30/07, Jake McHenry <linux@xxxxxxxxxxxxxxxxx> wrote:
>
>
> > -----Original Message-----
> > From: tedd [mailto:tedd@xxxxxxxxxxxx]
> > Sent: Friday, March 30, 2007 3:06 PM
> > To: Tijnema !; John Comerford
> > Cc: php-general@xxxxxxxxxxxxx
> > Subject: Re: [PHP] Alternative/Addition to using a CAPTCHA
> >
> > At 3:37 PM +0200 3/30/07, Tijnema ! wrote:
> > >On 3/30/07, John Comerford <johnc@xxxxxxxxxxxxxxxxxxxx> wrote:
> > >>I was reading the current tread on CAPTCHA and possible cracks and I
> > >>thought maybe I'd throw this out to the group to see what you think.
> > >>Recently I saw a forum where in order to post you first had
> > to click on
> > >>a div that was placed at a random location on the page, it read
> > >>something like, "Click here if you are human". I was thinking that
> > >>maybe you could put together a system that looks something
> > like this:
> > >>
> > >>http://people.aapt.net.au/JComerford/ClickMe.htm
> > >>
> > >>I was thinking you could use it in a couple of ways:
> > >>
> > >>1) As a replacement to a CAPTCHA image
> > >>2) When you click the image a CAPTCHA image is loaded into
> > the 'Click
> > >>Me' container
> > >>
> > >>The main problem is how to tell the server that the div has been
> > >>clicked, in a way that can't be simulated. I am not an expect with
> > >>either JS or PHP, but maybe some of the bigger brains out
> > there could
> > >>throw in their 2 cents......
> > >>
> > >>JC
> > >
> > >This looks maybe hard to crack, but actually it isn't very hard. All
> > >the clicking does is calling a javascript function. You still could
> > >submit the page without clicking the box.
> > >
> > >Tijnema
> >
> > Tijnema & John:
> >
> > The above link I've already done a long time ago. But check out my
> > dot CAPTCHA here:
> >
> > http://sperling.com/examples/p-captcha
> >
>
>
> Maybe I'm going blind.. But I don't see a circle on that page anywhere?
> Everywhere I click it fails......
> Jake

Hmm, just wanted to say that Jake, is it because i have my resolution
@ 1600x1200?

Tijnema

Actually, it just doesn't work with IE6, it works with FireFox. :)

Tijnema
>
>
>
> > This does not use javascript, but does use sessions.
> >
> > As you can see, the blue dot can be placed anywhere on the entrance
> > page. Granted this presents problem for the visually impaired, so I'm
> > not recommending it. But, it's just a proof of concept at this point.
> > Plus, I have not checked this on all browsers. I suspect that some
> > browsers may have problems with alpha channel images -- so your
> > mileage may differ.
> >
> > In any event, I think this may be a bit more difficult to crack than
> > something that replies upon javascript -- what do you think?
> >
> > Cheers,
> >
> > tedd
> >
> > --
> > -------
> > http://sperling.com http://ancientstones.com http://earthstones.com
> >
> > --
> > PHP General Mailing List (http://www.php.net/)
> > To unsubscribe, visit: http://www.php.net/unsub.php
> >
> > --
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> > Checked by AVG Free Edition.
> > Version: 7.5.446 / Virus Database: 268.18.23/740 - Release
> > Date: 3/30/2007 1:15 PM
> >
> >
>
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>

.

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