Introduction

Nobody likes dealing with passwords. After all, they exist solely as barriers to keep unauthorized people from accessing websites, servers, and other digital resources. Entering the occasional password is no big deal, but when you’re prompted for passwords dozens of times a day—forced to prove, over and over, that you are who you say you are—it can be mighty annoying.

Naturally, people take shortcuts to reduce that annoyance, such as picking short, easy-to-type passwords and reusing the same password everywhere. Unfortunately, those shortcuts also make it easier for another person (or, more likely, a computer) to guess your password, which can lead to all sorts of nasty consequences. And that sticky note or cheat sheet that makes ...

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