Claudio Lima

Teacher: Roza M. Zilles Borba

Novo Hamburgo May, 2011

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

• 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

server

Client

Client

Client

Client

Client server model

Receita Federal

SERVER can process 100

requests in 1 min

If a hacker build a software that can send 400 requests in 1 minute

RECEITA

FEDERAL

can process

100 requests

in 1 min

RECEITA

FEDERAL

SERVER is

can process

OUT-OF-DATA

It means that:

* ther server will not response to requests

* fix it takes time and money

* the website’s reputation is shaken

server

You

Foram entrevistados 69,7% dos alunos formados entre 2007 e 2010.

Appears this screen CAPTCHA

SOURCE

claudiolima@feevale.br

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