captcha.ppt

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avinash2008

The document discusses CAPTCHAs, which are programs that can distinguish humans from computers by generating tests that are easy for humans but difficult for computers. It provides background on CAPTCHAs, describes common types including text, graphic, and audio CAPTCHAs, and discusses techniques for breaking existing CAPTCHAs. It then proposes a new approach to CAPTCHAs that uses distorted images of concrete objects from Google Images and requires users to identify the object from a list of words to address limitations in other CAPTCHAs.

Technologie

Presented by: AVINASH MAURYA IT VI SEM 0829213008

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A CAPTCHA (a backronym for "Completely Automated Public Turing test to tell Computers and Humans Apart") is a type of challenge-response test used in computing to determine whether or not the user is human. CAPTCHAs are, by definition, fully automated, requiring little human maintenance or intervention to administer, producing benefits in cost and reliability. By definition, the algorithm used to create the CAPTCHA must be made public, though it may be covered by a patent. This is done to demonstrate that breaking it requires the solution to a difficult problem in the field of artificial intelligence (AI) rather than just the discovery of the (secret) algorithm, which could be obtained through reverse engineering or other means.

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Captcha are used widely over the World Wide Web to prevent automated programs in order to scrape a data from websites. Captcha is a challenge response test used to ensure that the response is generated by a person not by a computer. Users are asked to read and type a string of distorted characters in order to ensure that the user is human or not. Automation is real problem for web application. Automated attacks can exploit many services: 1. Blogs 2. Forums 3. Phishing 4. Theft of data Registration Websites use CAPTCHA (completely automated public turing test to tell computers and human apart) systems to prevent the bot programs from wasting their resources. Today is the Era of where technologies are changes very rapidly. So spammers are hackers are also trying something new to cracking captcha. That’s why it is necessary to developing an advanced technology to generating a captcha. Just like simply generating a Captcha Images from text, or rotating an object within images.

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captcha.ppt

1. Presented by: AVINASH MAURYA IT VI SEM 0829213008

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