August 20th, 2006The Ultimate CAPTCHA Custom Server Control
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| Author: | Peter Kellner, 73rd Street Associates |
| Date: | August 20, 2006 |
| Location: | San Jose, California USA |
| Topic: | Custom Server Control for CAPTCHA, Part 1 Usage |
Background
CAPTCHA stands for (Completely Automated Public Turing test to tell Computers and Humans Apart). The technology was originally developed at Carnegy Mellon University to help tell the difference between a human entering data into a computer system and a machine. The process typically involves showing the user a distorted picture of text and numbers, then the user must interpret this, type what they see into a text field and the computer checks for correctness. Below is a picture of a typical CAPTCHA expression. Wikipedia has a nice definition for CAPTCHA here.
