AUTHORIZATION_CAPCHA

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Contents Authorization Overview of CAPTCHA Motivation for CAPTCHA Applications Variety of CAPTCHAs Future of CAPTCHA decoding Conclusion 1 4/23/2013 Information Security

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Authorization Authorization is a form of access control. Access control means permissions are attached to an object. Main objective is to control operations executed by subjects in order to prevent actions that could damage data and resources. A CAPTCHA can be viewed as a form of access control. 2 4/23/2013 Information Security

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Overview of CAPTCHA CAPTCHA stands for C ompletely A utomated P ublic T uring tests to tell C omputers and H umans A part . Type of challenge-response test used in computing to ensure that the response is not generated by a computer . A technique to prove that you are HUMAN but Computer can’t prove . 200 million CAPTCHA are typed everyday . 3 4/23/2013 Information Security

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Motivation Free online accounts are being registered automatically many times and are being used to distribute stolen or copyrighted material. Spammers register themselves with free email accounts such as those provided by Gmail or Hotmail and use their bots to send unsolicited mails to other users of that email service. 4 4/23/2013 Information Security

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Applications 5 4/23/2013 Information Security Online Polls Protecting Web Registration Preventing comment spam Search engine bots E-Ticketing Email spam As a tool to verify digitized books Improve Artificial Intelligence (AI) technology

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Types of CAPTCHA Text based Gimpy, ez -gimpy Gimpy-r, Google CAPTCHA Simard’s HIP (MSN) Graphic based Bongo pix Audio Based 6 4/23/2013 Information Security

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Text Based CAPTCHAs Gimpy, ez -gimpy Pick a word Distort them and add noise and background Gimpy-r, Google CAPTCHA Pick random letter Distort them, add noise and background Simard’s HIP (MSN) Pick random letter and numbers Distort them and add arcs. 7 4/23/2013 Information Security

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Text Based CAPTCHAs 8 4/23/2013 Information Security

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Text Based CAPTCHAs 9 4/23/2013 Information Security

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4/23/2013 Information Security 10 Graphics Based CAPTCHAs Bongo Bongo is a program that asks the user to solve a visual pattern recognition problem. Display two series of blocks User must find the characteristic that sets the two series apart User is asked to determine which series each of four single blocks belongs to.

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4/23/2013 Information Security 11 Graphics Based CAPTCHAs PIX Create a large database of labeled images Pick a concrete object Pick one or more images of the object from the images database Distort the images Ask the user to pick the object for a list of words

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4/23/2013 Information Security 12 Graphics Based CAPTCHAs

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4/23/2013 Information Security 13 Audio Based CAPTCHAs Pick a word or a sequence of numbers at random Render them into an audio clip using a TTS software Distort the audio clip Ask the user to identify and type the word or numbers

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4/23/2013 Information Security 14 Funny CAPTCHA I am not a robot! I am a real man!

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4/23/2013 Information Security 15 Funny CAPTCHA

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Funny CAPTCHA 16 4/23/2013 Information Security

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Future of CAPTCHA decoding 17 4/23/2013 Information Security Is CAPTCHA losing the war of authorization? There’s no doubt that image processing software and computers themselves will become more powerful and eventually will be able to automatically decipher today’s Captcha images . The Firefox extension called Captcha Killer had a 80% success when tested on Yahoo pages.

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Future of CAPTCHA decoding 18 4/23/2013 Information Security

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Future of CAPTCHA decoding 19 4/23/2013 Information Security

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Future of CAPTCHA decoding 20 4/23/2013 Information Security

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Future of CAPTCHA decoding 21 4/23/2013 Information Security Video CAPTCHA Animated video technology that it claims make puzzles easier for humans to solve, but harder for bots and hackers to decipher. http ://docs.nucaptcha.com/embed/theme 3D CAPTCHA http ://www.3dcaptcha.net/

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Conclusion 22 4/23/2013 Information Security To protect the access control. Authorization technique should be more powerful. Need to find new policies for making CAPTCHA more effective and user friendly. Separate techniques for disabled people like: Color blind , Blind , Deaf people. Security researchers to create CAPTCHAs based on different AI problems.

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Thank You 23 4/23/2013 Information Security