|
Posted by FutureShock on January 21, 2009, 9:46 pm
Please log in for more thread options
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
Please log in for more thread options
show/hide quoted text
> Is there a way to perform a CAPTCHA test without PHP and its GD library?
Yes.
|
|
Posted by =?ISO-8859-1?Q?=22=C1lvaro_G=2 on January 22, 2009, 4:04 am
Please log in for more thread options FutureShock escribió:
show/hide quoted text
> Is there a way to perform a CAPTCHA test without PHP and its GD library?
>
> Just curious.
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 -- Mi web de humor al baño María: http://www.demogracia.com --
|
|
Posted by Curtis Dyer on January 22, 2009, 5:23 am
Please log in for more thread options On Thu, 22 Jan 2009 10:04:53 +0100, alvaro.NOSPAMTHANX@demogracia.com=20
wrote:
show/hide quoted text
> FutureShock escribi=C3=B3:
> > Is there a way to perform a CAPTCHA test without PHP and its GD library=
?
show/hide quoted text
> >=20
> > Just curious.
>=20
> The PHP site does. When you add a note to the manual you have to solve=20
> an arithmetic challenge. It'd be quite easy to break but it works well=20
> enough for small sites.
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.
show/hide quoted text
<http://google.com/search?q=3Dfive+plus+nine>
'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
> If you use your imagination, there're many ways to can anno^H^H^H^H test=
=20
show/hide quoted text
> your users apart from typing strange codes:
>=20
> - Click on the picture of the cat
> - Click on the red square
> - Click on the word that rhymes with captcha
>=20
> And getting back to your original question... You can always generate=20
> pictures without the GD library :)
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
Please log in for more thread options Curtis Dyer wrote:
show/hide quoted text
> On Thu, 22 Jan 2009 10:04:53 +0100, alvaro.NOSPAMTHANX@demogracia.com
> wrote:
>> FutureShock escribió:
>>> Is there a way to perform a CAPTCHA test without PHP and its GD library?
>>> Just curious.
>> 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.
>
> I liked this approach until I found out all you had to do to defeat
> it was forward the problem to a google search.
>
> 'fourteen'
>
> php.net still sticks with it, though, so I guess it can't be all that
> bad.
>
> Some random Captcha ideas: display a string of random characters, and
> ask the user to type only the capital letters or type in the amount
> of upper-case X's, etc., etc.
>
>> 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 :)
>
> Thanks for sharing, Ãlvaro. The more creative the Captcha, the
> better, and those all sound pretty unique.
>
> Unfortunately, the more popular a method is, the more likely bots
> will be programmed to defeat specfic Captchas. Another thing to
> consider is the traffic load of your site. Sometimes, light-medium
> traffic sites don't need advanced Captcha.
>
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?-
|
| Similar Threads | Posted | | What captcha script(s) do you like? | July 15, 2008, 5:31 pm |
| httpclient with captcha | October 31, 2008, 3:42 pm |
| Generating captcha | November 23, 2008, 8:44 pm |
| captcha doesn't work | March 4, 2009, 1:22 pm |
| captcha - do you know such solution? | February 21, 2010, 3:01 pm |
| Any good CAPTCHA to recommend? | June 14, 2006, 7:16 pm |
| Formmail + Captcha Verification | September 14, 2007, 10:26 am |
| session start and captcha... | March 8, 2009, 5:15 am |
| session start and captcha... | March 8, 2009, 5:11 am |
| Poor man's captcha: why wouldn't this work? | September 19, 2006, 8:27 pm |
|