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The Myths of Security by John Viega

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Chapter 34. CrAP-TCHA and the Usability/Security Tradeoff

Over the past few years, most online signups have involved CAPTCHAs, perhaps the security technology with the worst acronym: Completely Automated Public Turing test to tell Computers and Humans Apart.

It’s understandable that Google might want to see if it’s a human signing up for that account or some automated program—bad guys would love to have lots of Gmail accounts to be able to send spam through.

Similarly, I can understand why ticket agencies like Ticketmaster might require you to confirm that you’re a human before every purchase. Who wants ticket scalpers writing programs to automate buying tickets (well, besides the ticket brokers)?

But come on, don’t these things make life horrible? I signed up for a Gmail account, which I use to look at my daughter’s blog and post comments. Every single time I want to post a comment, I click Submit, and I get a pop up with a CAPTCHA, like the one shown in Figure 34-1.

Why the heck do I have to click two buttons (one to submit the comment and another to submit the word verification)??!! And it is a pain in the neck to type. I usually just don’t bother commenting on a blog if I have to see one of these (though I do make an exception for my daughter).

A CAPTCHA pop up
Figure 34-1. A CAPTCHA pop up

The idea behind a CAPTCHA in this situation is to prevent bad guys from spamming blog comments. But is that benefit ...

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