December 2011
Beginner
384 pages
9h 38m
English
Content preview from Web Application Security, A Beginner's GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Two-Factor and Three-Factor Authentication
Two-factor authentication means that the validation of someone’s identity is performed using factors from two of the three categories (that is, know, have, and are). For example, authenticating to an ATM with a card and a PIN is considered two-factor because the card is something that you have and the PIN is something that you know. However, the use of two passwords (or a password and a PIN) is not considered two-factor because they both come from the same category of something that you know. At the other end, using multiple factors from the same class doesn’t increase the factors, so using three passwords (know) and a smart card (have) is still only two-factor authentication. An authentication system ...
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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.