CAPTCHA stands for “completely automated public Turing test to tell computers and humans apart”. It’s those distorted text in almost all the sites that require sign up these days, blog, emails, forums, etc.
- The Official CAPTCHA Site
- An ASP.NET Framework for Human Interactive Proofs
- The Code Project: CAPTCHA Image – A fundamental approach to create CAPTCHA images using C# library classes
- The Code Project: A CAPTCHA Server Control for ASP.NET – in VB.NET
- Same control as the one above, but in C#, from CodePlex
Add the following to web.config:
<httpHandlers>
<add verb=”GET” path=”CaptchaImage.aspx” type=”WebControlCaptcha.CaptchaImageHandler, WebControlCaptcha” />
</httpHandlers>
<pages>
<controls>
<add tagPrefix=”captcha” namespace=”WebControlCaptcha” assembly=”WebControlCaptcha”/>
</controls>
</pages> - Finding Spambots with .NET and AI
By Bryan Xu