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A new image-based CAPTCHA using the orientation of the polygonally cropped sub-images |
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| Authors: | Jong-Woo Kim Woo-Keun Chung Hwan-Gue Cho |
| Affiliation: | 1. Center for U-Port IT Research and Education, Pusan National University, Busan, Republic of Korea 2. Dept. of Computer Science, Pusan National University, Jangjeon-dong, Keumjeong-gu, Busan, 609-735, Republic of Korea |
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