Visit: http://www.captcha.cc/
Free captcha service
We're trying to run this for free, and pay for the hosting & bandwidth fees, etc. based on traffic to the home page and faq page (on which we will sell ppc ads), and also any custom orders or high-security level requests.
What do I paste in?
When you generate the code, you'll get some javascript, some input boxes, an image and a submit button. You need to paste ALL these form elements into your web form. You can put the image wherever you want. You can keep your old submit button and just put our onclick in it:.
Clean, Fast & Secure
Captcha.cc's service makes it extremely simple to place very hard captcha images in front of a form submission. These images are easy for humans to read, but very hard for computers to read. This cuts down on spam for blog comments, contact form submissions and much more.
Smart Options
Our system allows you to paste a "code-free" javascript-driven "faux captcha" on your site, or a "javascript-free" version, that uses a lightweight validator that can be dropped in to your CGI, Perl, ASP, PHP or (any other) code. Or you can use both, allowing the convenience of an AJAX validated captcha with the security of server authentication.
Reliable
We run multiple servers, each one takes over function when the other is down.
Simple Code
Our system uses a method of validation that doesn't require "callbacks" or any other cumbersome, slow methods that our competitors require. Captcha.cc is the easiest system to implement, while offering a high level of security.
Other Captcha's Are Too Easy
We offer a service to test whether a captcha is too easy. Tell us the URL of a captcha, and I'll develop a simple program for "cracking it". Many times the solution relies on insecure key generation or parameter passing - not just advanced OCR. Approximately 90% of the captchas we encounter are easily cracked. Want to know if yours is secure? Ask us to crack it!
Can't someone just be paid to crack yours?
Sure. It would be easy enough to hire soneone in a poor country for a penny a captcha. This would circumvent just about anything, and would be affordable for many spammers. That's why we do bot filtering and we can do a lot more if needed. If you're still getting spam, email us and I'll analyze it and develop a solution for free or as cheap as we can.
Simple Offline Validation
You can't build a captcha that's in any way secure without some server validation. Fortunately we've done just that. Simply hash the submitted text with your private keyphrase and compare it to the "cap_h" variable. You can do something like if (!$ok) die "Bad captcha", depending on your script. Remember, at this point, it's either a person who passed, or a bot - since the javascript will have already validated a real person. All the validation is done offline, so you don't have to worry about connecting to our service or writing complex API code.
We're trying to run this for free, and pay for the hosting & bandwidth fees, etc. based on traffic to the home page and faq page (on which we will sell ppc ads), and also any custom orders or high-security level requests.
What do I paste in?
When you generate the code, you'll get some javascript, some input boxes, an image and a submit button. You need to paste ALL these form elements into your web form. You can put the image wherever you want. You can keep your old submit button and just put our onclick in it:.
Clean, Fast & Secure
Captcha.cc's service makes it extremely simple to place very hard captcha images in front of a form submission. These images are easy for humans to read, but very hard for computers to read. This cuts down on spam for blog comments, contact form submissions and much more.
Smart Options
Our system allows you to paste a "code-free" javascript-driven "faux captcha" on your site, or a "javascript-free" version, that uses a lightweight validator that can be dropped in to your CGI, Perl, ASP, PHP or (any other) code. Or you can use both, allowing the convenience of an AJAX validated captcha with the security of server authentication.
Reliable
We run multiple servers, each one takes over function when the other is down.
Simple Code
Our system uses a method of validation that doesn't require "callbacks" or any other cumbersome, slow methods that our competitors require. Captcha.cc is the easiest system to implement, while offering a high level of security.
Other Captcha's Are Too Easy
We offer a service to test whether a captcha is too easy. Tell us the URL of a captcha, and I'll develop a simple program for "cracking it". Many times the solution relies on insecure key generation or parameter passing - not just advanced OCR. Approximately 90% of the captchas we encounter are easily cracked. Want to know if yours is secure? Ask us to crack it!
Can't someone just be paid to crack yours?
Sure. It would be easy enough to hire soneone in a poor country for a penny a captcha. This would circumvent just about anything, and would be affordable for many spammers. That's why we do bot filtering and we can do a lot more if needed. If you're still getting spam, email us and I'll analyze it and develop a solution for free or as cheap as we can.
Simple Offline Validation
You can't build a captcha that's in any way secure without some server validation. Fortunately we've done just that. Simply hash the submitted text with your private keyphrase and compare it to the "cap_h" variable. You can do something like if (!$ok) die "Bad captcha", depending on your script. Remember, at this point, it's either a person who passed, or a bot - since the javascript will have already validated a real person. All the validation is done offline, so you don't have to worry about connecting to our service or writing complex API code.
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