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Kalsoom, Sajida, Sheikh Ziauddin, and Abdul Rehman Abbasi. "An image-based CAPTCHA scheme exploiting human appearance characteristics," KSII Transactions on Internet and Information Systems (TIIS), vol. 6, no. 2, pp. 734-750, Feb. 2012.
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Bursztein, Elie, Matthieu Martin, and John Mitchell. "Text-based CAPTCHA strengths and weaknesses," Proceedings of the 18th ACM conference on Computer and communications security. ACM, pp. 125-138, Oct. 2011.
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SungHo Kim, DaeHun Nyang and KyungHee Lee. "Breaking character-based CAPTCHA using color information," Journal of The Korea Institute of Information Security & Cryptology(JKIISC), 19(6), pp. 105-112, Dec. 2009.
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Recognition demos using CNN, "LeNet-5, convolutional neural networks", http://yann.lecun.com/exdb/lenet/
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Naver CAPTCHA link, https://nid.naver.com/login/image/captcha/nhncaptchav4.gif?key=??
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1,000 CAPTCHAs datasets, http://multimedia.korea.ac.kr/uploads/TEST_DATA_1000_image_set.zip
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CNN Library for MATLAB, https://github.com/rasmusbergpalm/DeepLearnToolbox
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LBP Library for MATLAB, https://github.com/adikhosla/feature-extraction/tree/master/features
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