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CodyT07

Gd Captcha

I wonder what people think about it. I notice it is a feature on PhpBB3 and well it seems to work. Bots seem to get on my other ones but still no bot sign up on PhpBB3 (so far) so it has to be good.
Here is a definition of it
http://www.onlamp.com/pub/a/php/2005/03/31/text_captcha.html
Quote:
You have probably seen the CAPTCHA project in action at some of your Web destinations. Its principal tool is a randomly created image that contains a phrase unmentioned in computer-readable text on the rendered page. The form asks the user to provide the phrase. If the form post does not contain the correct phrase, you can safely assume either the human made a user error, or it wasn't a human at all.

Seems straightforward

Thought what others think of it?

Just one thing I thought of it, Its somewhat hard to figure out sometimes.
admin (no pm's please)

We sometimes use this on the forums sign up process.
CodyT07

admin (no pm's please) wrote:
we sometimes use this on the forums sign up process.

Is that when registering on a forum or starting a forum?
admin (no pm's please)

When starting a forum, it has been there mostly switched off since day zero.
admin (no pm's please)

I may make it a project to put captcha on the forums themselves.

phpbb2s visual confirmation leaves a lot to be desired. I had not really looked at it until just now, and it is scarily breakable
admin (no pm's please)

In the office I am now using my own visual confirmation system.

It probably is not as clever as either capcha or even the standard phpbb2 systems, but it has the virtue of being ours alone.

Unless cracking systems are completely general in nature, a bespoke system may be better than using the two systems everyone is aiming to crack!
admin (no pm's please)

With a little more work, I think it is now pretty effective.

I have reduced the code to only use digits which I think makes it easier for humans, it will not make it any easier for crackers.
CodyT07

admin (no pm's please) wrote:
With a little more work, I think it is now pretty effective.

I have reduced the code to only use digits which I think makes it easier for humans, it will not make it any easier for crackers.

What about GD CAPTCHA noise?
PhpBB 3 wrote:
GD CAPTCHA noise:
Use noise to make the GD based CAPTCHA harder

Or is it just like the normal GD CAPTCHA?
admin (no pm's please)

The one I have just done, is not gd_capcha based at all.

Now undoubtedly it is not as strong as capcha, but mine has immense advantages.

1) No one knows the source code.
2) It will not be used in a million places giving every hacker/spammer the incentive to try and crack it.
3) I have done it out of my own ideas, hence it will not clone the same weaknesses of capcha.
CodyT07

admin (no pm's please) wrote:
The one I have just done, is not gd_capcha based at all.

Now undoubtedly it is not as strong as capcha, but mine has immense advantages.

1) No one knows the source code.
2) It will not be used in a million places giving every hacker/spammer the incentive to try and crack it.
3) I have done it out of my own ideas, hence it will not clone the same weaknesses of capcha.

I see where you getting that from. Keep it up hopefully we will see a decrease in spam over the 16k forums.

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