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![Page 1: Captcha](https://reader033.fdocuments.in/reader033/viewer/2022060121/5594841d1a28ab70198b468b/html5/thumbnails/1.jpg)
Claudio Lima
Teacher: Roza M. Zilles Borba
Novo Hamburgo May, 2011
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A test used in computing to determine if the user is human or a computer program.
Is asked a question that only a human can answer
Completely Automated Public Turing test to tell Computers and Humans Apart
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• Filling up a form on the web
• Entering in a chat
• Sending many mails at the same time
• Consulting your bank account on bank’s online systems
• Checking info at the government websites
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server
Client
Client
Client
Client
Client server model
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Receita Federal
SERVER can process 100
requests in 1 min
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If a hacker build a software that can send 400 requests in 1 minute
RECEITA
FEDERAL
can process
100 requests
in 1 min
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RECEITA
FEDERAL
SERVER is
can process
OUT-OF-DATA
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It means that:
* ther server will not response to requests
* fix it takes time and money
* the website’s reputation is shaken
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server
You
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Foram entrevistados 69,7% dos alunos formados entre 2007 e 2010.
Appears this screen CAPTCHA
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SOURCE
twitter.com/claudiodelima
claudiodelima.wordpress.com
Contact
• The Official captcha website. Available at http://www.captcha.net/ Access in May 27
2011.
• What captcha means . Available at http://www.kirps.com/web/main/_blog/all/do-you-
know-what-the-term-captcha-means.shtml Access in May 25 2011
Presentation available at slideshare.com/claudiodelima