Audio CAPTCHAs

This problem deals with visual CAPTCHAs.

a. Describe an example of a real-world visual CAPTCHA not discussed in the text and explain how this CAPTCHA works, that is, explain how a program would generate the CAPTCHA and score the result, and what a human would need to do to pass the test.

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b. For the CAPTCHA in part a, what information is available to an attacker?

This problem deals with audio CAPTCHAs.

a. Describe an example of a real-world audio CAPTCHA and explain how this CAPTCHA works, that is, explain how a program would generate the CAPTCHA and score the result, and what a human would need to do to pass the test.

b. For the CAPTCHA in part a, what information is available to an attacker?

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