Breaking Gmail Audio Captcha

Breaking Gmail’s Audio Captcha on Vimeo

https://vimeo.com/1301905

Breaking Audio CAPTCHAs - Carnegie Mellon University

https://www.cs.cmu.edu/~jdtam/Documents/Breaking_Audio_CAPTCHAs.pdf

Our approach to breaking the audio CAPTCHAs began by first splitting the audio files into segments of noise or words: for our experiments, the words were spoken letters or digits. We used manual transcriptions of the audio CAPTCHAs to get information regarding the location of each spoken word within the audio file.

Repetition breaks Google Audio CAPTCHA | Computerworld

https://www.computerworld.com/article/2754484/repetition-breaks-google-audio-captcha.html

Repetition breaks Google audio CAPTCHA | CSO Online

https://www.csoonline.com/article/2125660/repetition-breaks-google-audio-captcha.html

The flaw was described in a post to the Full Disclosure mailing list Monday. According to the post, anyone could pass a Google Audio CAPTCHA (Completely Automated Public Turing test to tell...

Repetition breaks Google Audio CAPTCHA - Computerworld

https://www.computerworld.com/article/2519843/repetition-breaks-google-audio-captcha.html

Breaking audio CAPTCHAs | Proceedings of the 21st ...

https://dl.acm.org/doi/10.5555/2981780.2981983

Audio CAPTCHAs are generally composed of a set of words to be identified, layered on top of noise. We analyzed the security of current audio CAPTCHAs from popular Web sites by using AdaBoost, SVM, and k-NN, and achieved correct solutions for test samples with accuracy up to 71%. Such accuracy is enough to consider these CAPTCHAs broken.