ASP.NET CAPTCHA Control

WebCaptcha™ allows you to protect your Web applications against automated form submissions from automated agents such as spam bots, while easily identifying human users that you want accessing your content and services. CAPTCHAs (short for Completely Automated Public Turing test to tell Computers and Humans Apart) issue a challenge-response test designed to make it hard for automated agents to pass. The WebCaptcha control is fully featured with its flexible styling and layout that give you full control over its appearance, fully accessible button to read the challenge text aloud (for the visually impaired), and a variety of configurable challenges that can include distorted images, question and answer, and math for actually separating human users from machines.

Key Features at a Glance

• Easy on Humans – WebCaptcha has tremendous accessibility support, being fully keyboard accessible and offering support to regenerate hard-to-read images, even reading challenge text aloud.
  
• Tough on Bots – Multiple challenge modes include distorted images generated by dictionary, math-like challenges, question-and-answer challenges, and image recognition challenges (e.g., Can you identify the Eiffel Tower?).
• Flexible Layout – You can configure almost anything about the layout and appearance of WebCaptcha from hiding its default input field, supplying your own input field, style the characteristics of the challenge image, use numbers and characters, and more.
• Secure Countermeasures – WebCaptcha protects your application from spam bots and crawlers with its security countermeasures that include hidden textbox protection during form submission, timeout protection from denial-of-service agents, and strict error message validation.