Reducing the Cost of Breaking Audio CAPTCHAs by Active and Semi-supervised Learning

Abstract

CAPTCHAs are challenge-response tests that are widely used in the Internet to distinguish human users from machines. In addition to the well-known visual CAPTCHAs, most Internet services also provide an audio-based scheme, e.g., To enable access for visually impaired users. Recent research has shown that most CAPTCHAs are vulnerable as they can be broken by… (More)
DOI: 10.1109/ICMLA.2014.16

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@article{Darnstdt2014ReducingTC, title={Reducing the Cost of Breaking Audio CAPTCHAs by Active and Semi-supervised Learning}, author={Malte Darnst{\"a}dt and Hendrik Meutzner and Dorothea Kolossa}, journal={2014 13th International Conference on Machine Learning and Applications}, year={2014}, pages={67-73} }