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A CAPTCHA For Classic ASP
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Email
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| Submitted on: |
7/10/2005 11:48:11 AM |
| By: |
Terje Hauger
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| Level: |
Intermediate |
| User Rating: |
By 2 Users |
| Compatibility: |
ASP (Active Server Pages) |
| Views: |
16371 |
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This application is a light weight CAPTCHA solution designed to prevent spam from being submitted via forms on blog type web pages. It is easy to implement, you need no components, it loads fast and it is user friendly because the CAPTCHA characters are easy to read.
This CAPTCHA is NOT an image, but simply a div tag styled with CSS.
More information here: http://www.u229.no/stuff/Captcha/
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Terms of Agreement:
By using this code, you agree to the following terms...
- You may use
this code in your own programs (and may compile it into a program and distribute it in compiled format for languages that allow it) freely and with no charge.
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Other 8 submission(s) by this author
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Other User Comments
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 7/14/2005 4:10:39 AM: M. Hakan Satman
anybody can hack this kind of codes to spam. because html code can be read by string manipulation algorithms. this must be unreadable image for ocr type algorithms.
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8/20/2005 5:44:58 AM: Terje Hauger
Yes, of course a bot may parse the html and that way crack the captcha and submit the form. But I think we need to keep in mind what is the scenario here.
If you need to protect a bank, then you wont be using a captcha at all. Because it can be cracked. And this goes for ANY captcha, even those made as images. Our task is to stop spam, so all we want is to create a way to distinguish between a human and a bot.
Some bots/robots are crawling the Internet looking for forms that are not protected at all and submit these with spam. More advanced bots will target popular blog applications like Blogger or TextPattern. If this captcha would become popular then at some point the bots would start parsing the html, for sure. Until that happens, this solution should be able to stop them.
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4/25/2006 6:03:51 AM: Tony
Regarding A CAPTCHA Solution Built With Classic ASP, CSS
Supposing I create the CAPTCHA on the fly by using
Response.Write (" ")
for example to create the entire javascript and form
will this reduce the possibilities of spider being able to dissect a form that is not even created yet
when it goes through the script page.
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4/25/2006 3:06:33 PM: Terje Hauger
Ola, it doesn't matter how you design your ASP code, it will still just return pure html.
terje hauger
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1/19/2007 11:17:55 PM: ramesh
thanks and good works
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9/8/2007 3:23:15 PM: Ramon_Morales
I've looked at the html that this puppy generates. It is not immediately obvious to me (a human) which question is being asked and which letters and colors are being displayed.
I am an experienced programmer and I think it would take an incredibly sophisticated bot to figure this thing out.
I have been abused by automated email harverters in the past, but I would be comfortable putting this thing on my websites to protect my contact forms.
Great work.
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6/5/2012 7:18:22 AM: srini
Hi,
I was trying to use the captcha code given by you in my application, somehow the typed text is not matching with the captcha characters.
http://ccc.rivals.com/captcha.asp
It would be great if i can get some hint from you
Thanks in advance
Srini
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