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If we've learned one thing from this Yahoo hack, it's that even after countless blogger and security expert pleas for smarter choices, people continue to create amazingly obvious passwords, leading us to wonder if they might be doing it on purpose. And if so, bravo!

In today's Yahoo Voices breach, for example, the most popular choice for account security were the now familiar most popular password when logins are breached: "123456" followed by "password." At face value, it's hard to see these password pickers as smart. They would be regarded by experts and any half-seasoned Internet user as incredibly weak passwords. And it's fun to laugh about the fact that there are some truly unskilled individuals left in digital humanity. These computer users should have already learned the importance of password safety from years of menacing hackers. If not, then last month's LinkedIn or eHarmony hacks should have resonated. But maybe these password pickers have learned. And they're the ones laughing, having picked those dumb passwords with full awareness of the online password situation.

General Internet thinking says the best way to ensure online safety is to pick different "strong passwords" for all your Internet selves and then change them often. That, as this XKCD comic illustrates, is exhausting and often counterproductive.

For some things, we want crazy, hard to guess (and hard to remember) passwords. Like, for our online banking accounts, or our email, which can be used to reset so many of our other passwords. But just as people use flimsy locks for their luggage and big hulking deadbolts for their front door, not all passwords need to be the same strength. As The Atlantic's James Fallows taught us after a Gawker password leak compromised the security of his wife's Gmail account, the biggest security threat of these passwords dump is if you use the same password -- strong or weak -- for everything.