August 2016
Intermediate to advanced
610 pages
11h 55m
English
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Safeguarding forms with a CAPTCHA
CAPTCHA is actually an acronym for Completely Automated Public Turing Test to Tell Computers and Humans Apart. The technique is similar to the one presented in the preceding recipe, Securing forms with a token. The difference is that instead of storing the token in a hidden form input field, the token is rendered into a graphic that is difficult for an automated attack system to decipher. Also, the intent of a CAPTCHA is slightly different from a form token: it is designed to confirm that the web visitor is a human being, and not an automated system.
How to do it...
- There are several approaches to CAPTCHA: presenting a question based on knowledge only a human would possess, text tricks, and a graphics image that ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.