Text-based CAPTCHA Strengths and Weaknesses
Based on sucessfull attacks on 13 of the most popular captchas schemes
we show how to attack text-based captchas and provide guidelines on how to design secure ones.
@CCS 2011
medias:2
Captcha research
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The Failure of Noise-Based Non-Continuous Audio Captchas
We show how using a generic approach, based on advanced audio processing and machine learning
algorithm, our captcha breaker "Decaptcha" is able to break all the popular audio CAPTCHA schemes,
including Microsoft and Yahoo.
@S&P 2011
medias:2
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How Good are Humans at Solving CAPTCHAs A Large Scale Evaluation
We perform a mass-scale user study on how people react
to the 21 most popular captcha schemes (13 images, 8 audios). This study reveals that
even the most popular captchas scheme are often difficult for humans,
with audio captchas being particularly problematic.
@S&P 2010
medias:2
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Decaptcha Breaking 75% of eBay Audio CAPTCHAs
This paper shows how Decpatcha is able to break eBay captchas with 75% accuracy.
We show that using a custom breaker (75%) greatly out-perform state of art speech recognition system (1%)
@WoOT 2009
medias:2