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CAPTCHA Questions |
AldarHawk
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I am building a custom CAPTCHA scblockedript 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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RE: CAPTCHA Questions |
Zephyr_Pure
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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.
I still check PMs from time to time.
Our responses were moronic, why shouldn't he follow suit? - Futility |
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RE: CAPTCHA Questions |
AldarHawk
The Manager
Posts: 1661
Location: Canada
Joined: 26.01.06
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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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RE: CAPTCHA Questions |
Zephyr_Pure
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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.
I still check PMs from time to time.
Our responses were moronic, why shouldn't he follow suit? - Futility |
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RE: CAPTCHA Questions |
SwartMumba
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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
The Manager
Posts: 1661
Location: Canada
Joined: 26.01.06
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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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RE: CAPTCHA Questions |
sacman
Member
Posts: 120
Location: Germany
Joined: 19.03.08
Rank: Hacker Level 1 |
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I Like the different angle thing with captchas, that is how i did them 
Semper fidelis
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RE: CAPTCHA Questions |
AldarHawk
The Manager
Posts: 1661
Location: Canada
Joined: 26.01.06
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http://ipicstorage.com/captcha/php_captcha.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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RE: CAPTCHA Questions |
Zephyr_Pure
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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.
I still check PMs from time to time.
Our responses were moronic, why shouldn't he follow suit? - Futility |
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RE: CAPTCHA Questions |
AldarHawk
The Manager
Posts: 1661
Location: Canada
Joined: 26.01.06
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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 
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RE: CAPTCHA Questions |
slpctrl
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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 . Damn LOL. Am I the only one that can't decipher a single character there?
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RE: CAPTCHA Questions |
AldarHawk
The Manager
Posts: 1661
Location: Canada
Joined: 26.01.06
Rank: God |
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I have a 75% success on the code.
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RE: CAPTCHA Questions |
spyware
Member
Posts: 4190
Location: The Netherlands
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Warn Level: 90
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CAPTCHA's are outdated anyway. We can't stop computers from computing computer-generated images.
Yeah, we're computed.
"The chowner of property." - Zeph 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 Since the grid is inescapable, what were the earlier lasers about? Does the corridor have a sense of humor? - Ebert |
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RE: CAPTCHA Questions |
slpctrl
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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 |
spyware
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Posts: 4190
Location: The Netherlands
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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  , 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.
"The chowner of property." - Zeph 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 Since the grid is inescapable, what were the earlier lasers about? Does the corridor have a sense of humor? - Ebert
Edited by spyware on 05-09-08 17:47 |
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RE: CAPTCHA Questions |
slpctrl
Member
Posts: 945
Location: 2147483647
Joined: 19.04.07
Rank: God |
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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 , 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  . But yeah would have been smart to just get the captcha and not the whole screen shot .
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RE: CAPTCHA Questions |
AldarHawk
The Manager
Posts: 1661
Location: Canada
Joined: 26.01.06
Rank: God |
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I ain't google mate... I do not have millions of dollars to spend on people to create fully custom scblockedripts like this.
Ohh and BTW that CAPTCHA is crackable...just difficult...
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RE: CAPTCHA Questions |
sacman
Member
Posts: 120
Location: Germany
Joined: 19.03.08
Rank: Hacker Level 1 |
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hmm i like it more simple
this is my captcha :
Semper fidelis
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RE: CAPTCHA Questions |
slpctrl
Member
Posts: 945
Location: 2147483647
Joined: 19.04.07
Rank: God |
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AldarHawk wrote:
I ain't google mate... I do not have millions of dollars to spend on people to create fully custom scblockedripts 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
sacman wrote:
hmm i like it more simple
this is my captcha :
Now there's a good one  .
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RE: CAPTCHA Questions |
AldarHawk
The Manager
Posts: 1661
Location: Canada
Joined: 26.01.06
Rank: God |
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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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