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Von Ahn, M. Blum, N.J. Hopper, and J. Langford, \u201cCAPTCHA: Using hard AI problems for security,\u201d International Conference on the Theory and Applications of Cryptographic Techniques, Lecture Notes in Computer Science, vol.2656, pp.294-311, Springer, 2003. 10.1007\/3-540-39200-9_18","DOI":"10.1007\/3-540-39200-9_18"},{"key":"2","doi-asserted-by":"crossref","unstructured":"[2] G. Moy, N. Jones, C. Harkless, and R. Potter, \u201cDistortion estimation techniques in solving visual CAPTCHAs,\u201d Proc. 2004 IEEE Computer Society Conference on Computer Vision and Pattern Recognition, CVPR 2004, pp.23-28, 2004. 10.1109\/cvpr.2004.1315140","DOI":"10.1109\/CVPR.2004.1315140"},{"key":"3","doi-asserted-by":"crossref","unstructured":"[3] A. Hindle, M.W. Godfrey, and R.C. Holt, \u201cReverse engineering CAPTCHAs,\u201d 15th Working Conference on Reverse Engineering, WCRE'08, pp.59-68, 2008. 10.1109\/wcre.2008.35","DOI":"10.1109\/WCRE.2008.35"},{"key":"4","unstructured":"[4] E. Bursztein, J. Aigrain, A. Moscicki, and J.C. Mitchell, \u201cThe end is nigh: Generic solving of text-based captchas,\u201d WOOT, 2014."},{"key":"5","doi-asserted-by":"publisher","unstructured":"[5] B. Biggio, I. Corona, D. Maiorca, B. Nelson, N. \u0160rndi\u0107, P. Laskov, G. Giacinto, and F. Roli, \u201cEvasion attacks against machine learning at test time,\u201d Joint European Conference on Machine Learning and Knowledge Discovery in Databases, Lecture Notes in Computer Science, vol.8190, pp.387-402, Springer, 2013. 10.1007\/978-3-642-40994-3_25","DOI":"10.1007\/978-3-642-40994-3_25"},{"key":"6","doi-asserted-by":"crossref","unstructured":"[6] N. Papernot, P. McDaniel, S. Jha, M. Fredrikson, Z.B. Celik, and A. Swami, \u201cThe limitations of deep learning in adversarial settings,\u201d 2016 IEEE European Symposium on Security and Privacy (EuroS&P), pp.372-387, 2016. 10.1109\/eurosp.2016.36","DOI":"10.1109\/EuroSP.2016.36"},{"key":"7","unstructured":"[7] I. Goodfellow, J. 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