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HellBound Hackers | Computer General | Increasing Security

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CAPTCHA Questions

AldarHawk
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Posted on 03-09-08 17:47
I am building a custom CAPTCHA script and I was wondering what other people use. I have it built to randomize the background in a few different ways, but the text is another story, I am looking to make each character a random color BUT I need to make the characters somewhat legible. Any thoughts?


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Posted on 03-09-08 18:17
Well, for the backgrounds, you could use basic hex color codes (000,333,666,999,CCC,FFF) and, for the text, you could alternate randomized color codes composed of digits either above (for 666 down) or below (for 999 up) the background color's single identifier. That should create lighter and darker colors for the text, respectively. Should be legible. Just in case, you'll want to have a link that will allow the user to have another Captcha generated in case they can't read it.


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RE: CAPTCHA Questions

AldarHawk
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Posted on 03-09-08 20:21
okay, all good in words. I could have spat that out myself.

I have it working just need it to make the text legible as well as ensure that the text is not decipherable to a bot.

I have the basic code and the color scheme all set up just need to know if anyone has a way around the illegible text bit



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Posted on 03-09-08 20:53
AldarHawk wrote:
okay, all good in words. I could have spat that out myself.


Well, then you probably should've done so when asking the question... to avoid getting a response that you weren't happy with.

A few choices: narrow the amount of variation in color scheme by operating on a set amount and particular set of colors, run lines and random debris through the CAPTCHA image that will partially obscure parts of the images but still be recognizable, or use a custom font that has non-convential shapes for the letters.

Or, if you want to get really creative, use image-based captcha techniques instead of letter-based ones. Use shapes and symbols to represent letters, then have your key say things like "s is the third symbol, a is the first, q is the second from the last". It's not possible to prevent all chances of bots getting in... but, if you want to confuse them for a while, that should do a decent job.

Finally... you could try putting more letters in the image than you actually want the user to type, then say something like "type all the letters on the bottom" or "type the letters all in lowercase" or something. Something that it would take a significant amount of learning for a bot to pick up as a technique.


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Posted on 03-09-08 22:39
Alderhawk, can you post a few pics of your image captcha, or a link to it, when you are done. I am curious to see how it comes out.


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RE: CAPTCHA Questions

AldarHawk
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Posted on 04-09-08 19:09
When I finish re-writing it I will post the link to it. I have a semi-working copy right now but it is not what I am wanting it to be. So I am re-writing it.


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Posted on 04-09-08 20:17
I Like the different angle thing with captchas, that is how i did them Smile


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RE: CAPTCHA Questions

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Posted on 05-09-08 16:17
http://ipicstorag. . .aptcha.php

Here is my WiP right now. It will keep changing, Let me know where you would change it. and what have you.


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Posted on 05-09-08 16:30
I'd make some of the lines in the background white so that it will confuse bots that are looking for letter patterns. Also, you might consider making it so that the user has to enter all of the items either uppercase or lowercase, regardless of what case it is in the picture; bots would probably be looking to use the exact case if they're able to discern the alphanumerical characters in your Captcha. Other than that... looks fine.


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RE: CAPTCHA Questions

AldarHawk
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Posted on 05-09-08 16:40
The font color is 100% variable. as are the lines.

The case is set...I have not set it yet though in the form, still trying to get the shit to work for me Pfft


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Posted on 05-09-08 17:29
Good god man, I can't read any of that shit. I think you've done wayyyyyy too much with it, you can make it impossible for bots to 'read' while making it legible Pfft. Damn LOL. Am I the only one that can't decipher a single character there?


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RE: CAPTCHA Questions

AldarHawk
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Posted on 05-09-08 17:36
I have a 75% success on the code.


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RE: CAPTCHA Questions

spyware
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Posted on 05-09-08 17:39
CAPTCHA's are outdated anyway. We can't stop computers from computing computer-generated images.

Yeah, we're computed.



img507.imageshack.us/img507/3580/spynewsig3il1.png
"The chowner of property." - Zeph
[small]
Widespread intellectual and moral docility may be convenient for leaders in the short term,
but it is suicidal for nations in the long term.
- Carl Sagan
[center]�Since the grid is inescapable, what were the earlier lasers about? Does the corridor have a sense of humor?� - Ebert[/ce
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RE: CAPTCHA Questions


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Posted on 05-09-08 17:44
AldarHawk wrote:
I have a 75% success on the code.


Yeah, it's just that...well all your efforts to scramble it as much as possible/put as many lines over it as you can/make the bg and text color variable...it's all pretty unnecessary. Look at the google (gmail) CAPTCHA:

http://img145.imageshack.us/img145/2166/captchacx3.jpg

That's a nice one, I don't see how anyone could get under 100% success on it and I don't see any bots finding a pattern with it and cracking it.


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RE: CAPTCHA Questions

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Posted on 05-09-08 17:46
slpctrl wrote:
http://img145.imageshack.us/img145/2166/captchacx3.jpg


slpctrl, nice effort with the image and all, but please learn to cut away the stuff we don't need Wink, this way you can reduce image size, which will result in faster loading.


Edit:

Plus, with a little data mining, your screenshot reveals WAY TOO MUCH about you.



img507.imageshack.us/img507/3580/spynewsig3il1.png
"The chowner of property." - Zeph
[small]
Widespread intellectual and moral docility may be convenient for leaders in the short term,
but it is suicidal for nations in the long term.
- Carl Sagan
[center]�Since the grid is inescapable, what were the earlier lasers about? Does the corridor have a sense of humor?� - Ebert[/ce

Edited by spyware on 05-09-08 17:47
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Posted on 05-09-08 17:53
spyware wrote:
slpctrl wrote:
http://img145.imageshack.us/img145/2166/captchacx3.jpg


slpctrl, nice effort with the image and all, but please learn to cut away the stuff we don't need Wink, this way you can reduce image size, which will result in faster loading.


Edit:

Plus, with a little data mining, your screenshot reveals WAY TOO MUCH about you.


I aint scurred B). But yeah would have been smart to just get the captcha and not the whole screen shot Pfft.


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RE: CAPTCHA Questions

AldarHawk
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Posted on 05-09-08 18:05
I ain't google mate... I do not have millions of dollars to spend on people to create fully custom scripts like this.

Ohh and BTW that CAPTCHA is crackable...just difficult...


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Posted on 05-09-08 18:15
hmm i like it more simple

this is my captcha :

img391.imageshack.us/img391/5444/captchaus5.jpg



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Posted on 05-09-08 18:31
AldarHawk wrote:
I ain't google mate... I do not have millions of dollars to spend on people to create fully custom scripts like this.

Ohh and BTW that CAPTCHA is crackable...just difficult...


You don't need to be google or have millions to code an effective yet simple CAPTCHA Pfft

sacman wrote:
hmm i like it more simple

this is my captcha :

img391.imageshack.us/img391/5444/captchaus5.jpg


Now there's a good one Grin.


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RE: CAPTCHA Questions

AldarHawk
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Posted on 05-09-08 19:07
Once again, Easily cracked.

All I would have to do is write a bot to decipher the two colors and POOF instant crack.


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