Nonsense, of course, but it helps illustrate a point: You will need a computer password today, maybe a half dozen or more — those secret sign-ins that serve as sentries for everything from Amazon shopping carts to work files to online bank accounts. Just when you have them all sorted out, along comes another “urgent” directive from the bank or IT department — time to reset those codes, for safety’s sake. And the latest lineup of log-ins you’ve concocted won’t last for long, either. Some might temporarily stay in your head, others are jotted on scraps of paper and stuffed in a wallet. A few might be taped to your computer monitor in plain view (or are those are from last year’s batch? Who can remember?).

Now, a study has concluded what lots of us have long suspected: Many of these irritating security measures are a waste of time. The study, by a top researcher at Microsoft, found that instructions intended to spare us from costly computer attacks often exact a much steeper price in the form of user effort and time expended.

Password Hasher is a Firefox security extension for generating site-specific strong passwords from one (or a few) master key(s).

Password Hasher is a Firefox security extension for generating site-specific strong passwords from one (or a few) master key(s).

SuperGenPass is a different kind of password manager. Instead of storing your passwords on your hard disk or online—where they are vulnerable to theft and data loss—SuperGenPass uses a hash algorithm to transform a master password into unique, complex passwords for the Web sites you visit. There’s no software to install: SuperGenPass is a bookmarklet and runs right in your Web browser. And since it never stores or transmits your passwords, it’s ideal for use on multiple and public computers. It’s also completely free.

SuperGenPass is a different kind of password manager. Instead of storing your passwords on your hard disk or online—where they are vulnerable to theft and data loss—SuperGenPass uses a hash algorithm to transform a master password into unique, complex passwords for the Web sites you visit. There’s no software to install: SuperGenPass is a bookmarklet and runs right in your Web browser. And since it never stores or transmits your passwords, it’s ideal for use on multiple and public computers. It’s also completely free.

SuperGenPass is a different kind of password manager. Instead of storing your passwords on your hard disk or online—where they are vulnerable to theft and data loss—SuperGenPass uses a hash algorithm to transform a master password into unique, complex passwords for the Web sites you visit. There’s no software to install: SuperGenPass is a bookmarklet and runs right in your Web browser. And since it never stores or transmits your passwords, it’s ideal for use on multiple and public computers. It’s also completely free.