Constructing Secure Audio CAPTCHAs by Exploiting Differences between Humans and Machines

@inproceedings{Meutzner2015ConstructingSA,
  title={Constructing Secure Audio CAPTCHAs by Exploiting Differences between Humans and Machines},
  author={Hendrik Meutzner and Santosh Gupta and Dorothea Kolossa},
  booktitle={CHI},
  year={2015}
}
To prevent abuses of Internet services, CAPTCHAs are used to distinguish humans from programs where an audio-based scheme is beneficial to support visually impaired people. Previous studies show that most audio CAPTCHAs, albeit hard to solve for humans, are lacking security strength. In this work we propose an audio CAPTCHA that is far more robust against automated attacks than it is reported for current CAPTCHA schemes. The CAPTCHA exhibits a good trade-off between human usability and security… CONTINUE READING