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OT: (sortof) Captcha?

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OT: (sortof) Captcha? FutureShock 01-21-2009
Posted by FutureShock on January 21, 2009, 9:46 pm
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Is there a way to perform a CAPTCHA test without PHP and its GD library?

Just curious.

Scotty

Posted by rf on January 21, 2009, 11:39 pm
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show/hide quoted text

Yes.



Posted by =?ISO-8859-1?Q?=22=C1lvaro_G=2 on January 22, 2009, 4:04 am
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FutureShock escribió:
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The PHP site does. When you add a note to the manual you have to solve
an arithmetic challenge. It'd be quite easy to break but it works well
enough for small sites.

If you use your imagination, there're many ways to can anno^H^H^H^H test
your users apart from typing strange codes:

- Click on the picture of the cat
- Click on the red square
- Click on the word that rhymes with captcha

And getting back to your original question... You can always generate
pictures without the GD library :)



--
-- http://alvaro.es - Álvaro G. Vicario - Burgos, Spain
-- Mi sitio sobre programación web: http://bits.demogracia.com
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Posted by Curtis Dyer on January 22, 2009, 5:23 am
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On Thu, 22 Jan 2009 10:04:53 +0100, alvaro.NOSPAMTHANX@demogracia.com=20
wrote:
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?
show/hide quoted text

I liked this approach until I found out all you had to do to defeat=20
it was forward the problem to a google search.

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'fourteen'

php.net still sticks with it, though, so I guess it can't be all that=20
bad.

Some random Captcha ideas: display a string of random characters, and=20
ask the user to type only the capital letters or type in the amount=20
of upper-case X's, etc., etc.

show/hide quoted text
=20
show/hide quoted text

Thanks for sharing, =C3=81lvaro. The more creative the Captcha, the=20
better, and those all sound pretty unique.

Unfortunately, the more popular a method is, the more likely bots=20
will be programmed to defeat specfic Captchas. Another thing to=20
consider is the traffic load of your site. Sometimes, light-medium=20
traffic sites don't need advanced Captcha.

--=20
Curtis
$email =3D str_replace('sig.invalid', 'gmail.com', $from);

Posted by Norman Peelman on January 22, 2009, 6:23 am
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Curtis Dyer wrote:
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That's why you choose a random method. You don't have to serve the
same type of captcha every time.


--
Norman
Registered Linux user #461062
-Have you been to www.php.net yet?-

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