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Yet for a third type, audio challenges can be used optionally for visually impaired users.

For another test type, users are expected to choose correct images out of a variety of other images in response to a test question. To pass the test, users are expected to type the characters they see in distorted image correctly in the text box. This is achieved by a series of challenge and response tests where users are expected to answer correctly.Īs a challenge and response mechanism, a randomly generated sequence of letter and/or numbers that appear as distorted images are displayed to the users. It is a widely used technology to determine whether the user behind a computer is real or a spam robot. Invented in 1997, CAPTCHA stands for Completely Automated Public Turing test to tell Computers and Humans Apart. Proof of concept (PoC) of the attack reveals that it work with 97% accuracy. Google Speech-to-Text API Can Be Used to Bypass Google reCAPTCHA: A security researcher has recently demonstrated that Google’s audio reCAPTCHA can be bypassed effectively by using Google’s own Speech-to-Text API.