February 2026
Beginner to intermediate
160 pages
3h 43m
English
Content preview from Take Control of Your Passwords, 4th Edition
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Appendix A: Use Two-Factor Authentication
Earlier, in Multi-Factor Authentication and Manage Email Options, I said that some companies enable (or require) you to use a combination of factors—things you know, things you have, and things you are—to prove your identity. In the most common implementation, one factor is your password (a thing you know) and the second is an object (a thing you have). The result is two-factor authentication (2FA).
A variation on this process requires your regular password plus a time-based, one-time password (TOTP); that password is generated by an app or sent to you via SMS or email. Because the TOTP is still, strictly speaking, something you know—and because a single device could unlock your password and display ...
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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.