Chapter 5. Implementing CAPTCHA using Draggable and Droppable
In the previous chapter, we created a reddit news reader that was a bit complex from a coding point of view. To compensate for this, we will reduce our pace a bit in this chapter and develop various implementations of CAPTCHA.
CAPTCHA (short for Completely Automated Public Turing test to tell Computers and Humans Apart) is a form of test where web forms present questions to users that are supposed to be solved by humans only.
Imagine a simple registration form of a website. If you know all the fields present in the page, you can write a script to register as many times as you can.
Now, suppose a CAPTCHA challenge is placed in the registration form, where the user is shown 10 different ...
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