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مهندسي اينترنت CAPTCHA) )

مهندسي اينترنت CAPTCHA) ). به نام خدا. سعید آشیان Email: saeid@ashian.id.ir Website: www.ashian.id.ir. HTTP does not distinguish between human & machine users. Malicious bots can be anonymous and distributed. CAPTCHA. A PROGRAM THAT CAN TELL WHETHER ITS USER IS A HUMAN OR A COMPUTER.

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مهندسي اينترنت CAPTCHA) )

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  1. مهندسي اينترنتCAPTCHA)) به نام خدا سعید آشیان Email: saeid@ashian.id.ir Website: www.ashian.id.ir

  2. HTTP does not distinguish between human & machine users. • Malicious bots can be anonymous and distributed.

  3. CAPTCHA A PROGRAM THAT CAN TELL WHETHER ITS USER IS A HUMAN OR A COMPUTER

  4. CAPTCHA A PROGRAM THAT CAN GENERATE AND GRADE TESTS THAT: A. MOST HUMANS CAN PASS B. CURRENT COMPUTER PROGRAMS CANNOT PASS

  5. PICKS RANDOM STRING OF LETTERS RENDERS IT INTOA DISTORTED IMAGE oamg EXAMPLE

  6. …AND GENERATES A TEST: TYPE THE CHARACTERS THAT APPEAR IN THE IMAGE

  7. CAPTCHA Completely Automated Public Turing test to tell Computers & Humans Apart

  8. QUICKVOTE Which is the best Computer Science Grad School in the US? Berkeley MIT CMU Princeton Cornell Stanford vote

  9. APPLICATIONS • Protecting website registration. • Preventing comment spam in blogs • Protecting E-MAIL (Preventing Spam) • Preventing BruteForce And Dictionary attacks • Protecting Online polls

  10. SPAM

  11. EXAMPLES OF CAPTCHAS

  12. EXAMPLES OF CAPTCHAS General Approaches: • Text (ASCII/Unicode) • Image • Speech • Animation • 3-D • Combinations of all above

  13. EXAMPLES OF CAPTCHAS PIX WHAT ARE THESE PICTURES OF?

  14. EXAMPLES OF CAPTCHAS PIX WHAT ARE THESE PICTURES OF? THE IMAGES NEED TO BE RANDOMLY DISTORTED

  15. EXAMPLES OF CAPTCHAS PIX WHAT ARE THESE PICTURES OF?

  16. EXAMPLES OF CAPTCHAS BONGO VISUAL ANALOGY PROBLEMS

  17. EXAMPLES OF CAPTCHAS SOUND-BASED CAPTCHA HUMANS ARE BETTER THAN COMPUTERS AT UNDERSTANDING SPOKEN LANGUAGE

  18. EXAMPLES OF CAPTCHAS

  19. EXAMPLES OF CAPTCHAS

  20. EXAMPLES OF CAPTCHAS

  21. EXAMPLES OF CAPTCHAS

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