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<How To: CAPTCHA in VB.NET ⁄ >




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This tutorial will guide you through creating a CAPTCHA security image for your web application in VB.Net using Visual Studio 2005. Before we jump into the code lets take a look at what a CAPTCHA is. CAPTCHA stands for Completely Automated Public Turing Test To Tell Computers And Humans Apart." What does this mean? It is a program that can tell humans from machines using some type of generated test. A test most people can easily pass but a computer program cannot. The term CAPTCHA was coined in 2000 by Luis von Ahn, Manuel Blum, Nicholas Hopper and John Langford of Carnegie Mellon University. These 4 individuals are credited with creating the first CAPTCHA, which was used by Yahoo!



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