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Any good CAPTCHA to recommend?

P: n/a
After a Google search, I see that quite a few CAPTCHA implementations
in PHP are available. I'd like one that's not (easily) OCR-able, or
otherwise crackable. Open source or commercial is not important. Any
recommendations, or experience with a specific one to share?

I get a lot of SPAM entries on a guestbook, and want to protect it.
I'll require users to solve a CAPTCHA before their entry is accepted. I
might use CAPTCHAs to protect other form submissions, though.

Jun 14 '06 #1
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12 Replies


P: n/a

"Francois Bonzon" <NO*************@bonzon.com> wrote in message
news:11************@sicinfo3.epfl.ch...
After a Google search, I see that quite a few CAPTCHA implementations in
PHP are available. I'd like one that's not (easily) OCR-able, or otherwise
crackable. Open source or commercial is not important. Any
recommendations, or experience with a specific one to share?

I get a lot of SPAM entries on a guestbook, and want to protect it. I'll
require users to solve a CAPTCHA before their entry is accepted. I might
use CAPTCHAs to protect other form submissions, though.


My experience is that CAPTCHA doesn't work.

I get lots of spam though.

:(

Jun 14 '06 #2

P: n/a
Francois Bonzon wrote:
I get a lot of SPAM entries on a guestbook, and want to protect it.
I'll require users to solve a CAPTCHA before their entry is accepted. I
might use CAPTCHAs to protect other form submissions, though.


Don't use CAPTCHA. Make users sign up to your service and check their
e-mail address is valid. CAPTCHA is inaccessible and not cross-browser
compatible.

--
Toby A Inkster BSc (Hons) ARCS
Contact Me ~ http://tobyinkster.co.uk/contact

Jun 15 '06 #4

P: n/a
Rik
Toby Inkster wrote:
Francois Bonzon wrote:
I get a lot of SPAM entries on a guestbook, and want to protect it.
I'll require users to solve a CAPTCHA before their entry is
accepted. I might use CAPTCHAs to protect other form submissions,
though.


Don't use CAPTCHA. Make users sign up to your service and check their
e-mail address is valid. CAPTCHA is inaccessible and not cross-browser
compatible.


CAPTCHA isn't a specific method.... I'm sure there are accessable,
cross-browser CAPTCHA methods.

Grtz,
--
Rik Wasmus
Jun 15 '06 #5

P: n/a
Francois Bonzon wrote:
After a Google search, I see that quite a few CAPTCHA implementations
in PHP are available. I'd like one that's not (easily) OCR-able, or
otherwise crackable. Open source or commercial is not important. Any
recommendations, or experience with a specific one to share?

I get a lot of SPAM entries on a guestbook, and want to protect it.
I'll require users to solve a CAPTCHA before their entry is accepted.
I might use CAPTCHAs to protect other form submissions, though.


Take a look at www.phpclasses.org, there's a good one gone up there
recently
Jun 15 '06 #6

P: n/a
On or about 6/15/2006 2:27 AM, it came to pass that Toby Inkster wrote:
Francois Bonzon wrote:
I get a lot of SPAM entries on a guestbook, and want to protect it.
I'll require users to solve a CAPTCHA before their entry is accepted. I
might use CAPTCHAs to protect other form submissions, though.


Don't use CAPTCHA. Make users sign up to your service and check their
e-mail address is valid. CAPTCHA is inaccessible and not cross-browser
compatible.

CAPTCHA works well at stopping most robots and hackers from using online
contact and signup forms. The version I use from
http://freshmeat.net/p/captchaphp (with some modifications and a fix or
two) works well and provides for all browsers, including IE where
external image files are required. My attempts at using embedded images
with IE7 in strict mode were futile, although embedded images work with
most other modern browsers.

I do agree that validation of the email address and it's verification
using checkdnsrr($domain, 'MX') is required.
Jun 15 '06 #7

P: n/a
Hi,

I've used PhpCaptcha by http://www.ejeliot.com/. It looks Ok for me.

--
Sincerely,
Alexander
http://www.alexatnet.com/

Francois Bonzon wrote:
After a Google search, I see that quite a few CAPTCHA implementations
in PHP are available. I'd like one that's not (easily) OCR-able, or
otherwise crackable. Open source or commercial is not important. Any
recommendations, or experience with a specific one to share?

I get a lot of SPAM entries on a guestbook, and want to protect it.
I'll require users to solve a CAPTCHA before their entry is accepted. I
might use CAPTCHAs to protect other form submissions, though.


Jun 15 '06 #8

P: n/a

Toby Inkster wrote:
Francois Bonzon wrote:
I get a lot of SPAM entries on a guestbook, and want to protect it.
I'll require users to solve a CAPTCHA before their entry is accepted. I
might use CAPTCHAs to protect other form submissions, though.


Don't use CAPTCHA. Make users sign up to your service and check their
e-mail address is valid. CAPTCHA is inaccessible and not cross-browser
compatible.


I've written an accessible alternative to the typical graphics based
CAPTCHA, which will work in any web browser, including lynx, you can
get it at http://system-x.info/?pageid=18&menutree=47

Jun 15 '06 #9

P: n/a
Rik wrote:
CAPTCHA isn't a specific method.... I'm sure there are accessable,
cross-browser CAPTCHA methods.


Thre aren't.

--
Toby A Inkster BSc (Hons) ARCS
Contact Me ~ http://tobyinkster.co.uk/contact

Jun 16 '06 #10

P: n/a
Message-ID: <11**********************@r2g2000cwb.googlegroups. com> from
arclight contained the following:

I've written an accessible alternative to the typical graphics based
CAPTCHA, which will work in any web browser, including lynx, you can
get it at http://system-x.info/?pageid=18&menutree=47


Ahem...

"...click here for an example...."

--
Geoff Berrow (put thecat out to email)
It's only Usenet, no one dies.
My opinions, not the committee's, mine.
Simple RFDs http://www.ckdog.co.uk/rfdmaker/
Jun 16 '06 #11

P: n/a
In article <11************@sicinfo3.epfl.ch>, NO*************@bonzon.com
says...
I get a lot of SPAM entries on a guestbook, and want to protect it.
I'll require users to solve a CAPTCHA before their entry is accepted. I
might use CAPTCHAs to protect other form submissions, though.


I'd suggest using CAPTCHA is a great way to ensure you end up with an
empty guestbook and very few return visitors.

Jun 17 '06 #12

P: n/a
arclight wrote:
<snip>
I've written an accessible alternative to the typical graphics based
CAPTCHA, which will work in any web browser, including lynx, you can
get it at http://system-x.info/?pageid=18&menutree=47


Having written couple of bots, I would say this is Ok, especially
when you don't have GD--but stilll very easy to hack:
1. The bot first see the question and it logs the question so that
the person who runs the bot will add the answer to it's (bot's) list
2. Next time bot sees the same question, and it answers from it's
list; otherwise go to step 1

For helping blind people, it is worth to add sound files as in
e-gold.com; the implementation is also easy as creating WAV files on
the fly is extremely easy with PHP.

--
<?php echo 'Just another PHP saint'; ?>
Email: rrjanbiah-at-Y!com Blog: http://rajeshanbiah.blogspot.com/

Jun 18 '06 #13

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