Comments on: Chaining CAPTCHAs for fun and profit? http://lemire.me/blog/archives/2008/01/30/chaining-captchas-for-fun-and-profit/ Computer Scientist and Open Scholar: Databases, Information Retrieval, Business Intelligence. Wed, 23 May 2012 16:42:57 +0000 hourly 1 http://wordpress.org/?v=3.3.2 By: Stefan Ciobaca http://lemire.me/blog/archives/2008/01/30/chaining-captchas-for-fun-and-profit/comment-page-1/#comment-49781 Stefan Ciobaca Sat, 15 Mar 2008 01:12:44 +0000 http://www.daniel-lemire.com/blog/archives/2008/01/30/chaining-captchas-for-fun-and-profit/#comment-49781 Why do you think that the human error will be the same for the 4 CAPTCHAs? Maybe humans gets tired after filling the first one and then their performance drops. Also: why do you think the number of people who take the time to fill one CAPTCHA will be equal to the number of people willing to fill 4? I have a strong suspicion it would drop. Why do you think that the human error will be the same for the 4 CAPTCHAs? Maybe humans gets tired after filling the first one and then their performance drops.

Also: why do you think the number of people who take the time to fill one CAPTCHA will be equal to the number of people willing to fill 4? I have a strong suspicion it would drop.

]]> By: Jonathan Katz http://lemire.me/blog/archives/2008/01/30/chaining-captchas-for-fun-and-profit/comment-page-1/#comment-49724 Jonathan Katz Sun, 03 Feb 2008 19:53:22 +0000 http://www.daniel-lemire.com/blog/archives/2008/01/30/chaining-captchas-for-fun-and-profit/#comment-49724 The CHS paper is the right reference...don't their results already give what you want? The CHS paper is the right reference…don’t their results already give what you want?

]]> By: ade http://lemire.me/blog/archives/2008/01/30/chaining-captchas-for-fun-and-profit/comment-page-1/#comment-49720 ade Thu, 31 Jan 2008 13:53:22 +0000 http://www.daniel-lemire.com/blog/archives/2008/01/30/chaining-captchas-for-fun-and-profit/#comment-49720 Have you seen ReCaptcha: http://recaptcha.net/learnmore.html They're using 2 captchas and turning the cpu power of the 'evil machines' to their own ends. Currently that consists of digitising books from the Internet Archive. Have you seen ReCaptcha: http://recaptcha.net/learnmore.html

They’re using 2 captchas and turning the cpu power of the ‘evil machines’ to their own ends. Currently that consists of digitising books from the Internet Archive.

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