Geodesic
Reliability analysis of graphical CAPTCHA-systems by the example of KCAPTCHA
Prikladnaâ diskretnaâ matematika, no. 13 (2011), pp. 40-41
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CAPTCHA constructed on the basis of distorted images is considered. Reliability of CAPTCHA image is analysed for a system KCAPTCHA. An algorithm for automated recognition of generated images is presented. The effectiveness of graphic CAPTHCHA recognition and reliability are discussed. 
@article{PDM_2011_13_a21,
     author = {M. B. Abrosimov and A. A. Matorin},
     title = {Reliability analysis of graphical {CAPTCHA-systems} by the example of {KCAPTCHA}},
     journal = {Prikladna\^a diskretna\^a matematika},
     pages = {40--41},
     year = {2011},
     number = {13},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDM_2011_13_a21/}
}
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M. B. Abrosimov; A. A. Matorin. Reliability analysis of graphical CAPTCHA-systems by the example of KCAPTCHA. Prikladnaâ diskretnaâ matematika, no. 13 (2011), pp. 40-41. http://geodesic.mathdoc.fr/item/PDM_2011_13_a21/

[1] Proekt KCAPTCHA, 2011 http://www.captcha.ru/kcaptcha/

[2] Zhang T. Y., Suen C. Y., “A fast parallel algorithm for thinning digital patterns”, Comm. ACM, 27:3 (1984), 236–239 | DOI