Design and Improvement of Chinese CAPTCHA Based on Mathematical Expression
Dinghua He · 2012
Uses CAPTCHA in web page can to a certain extent, to resist the attacks from network. But many sites using the CAPTCHA is based on the English or the digital characters, and only adopts a simple deformation treatment, safety not guaranteed. The Chinese CAPTCHA in upper case characters, and adding noise, deformation processing, the machine automatically recognizes the very difficult. The experiment show: the Chinese CAPTCHA based mathematical expression has higher security.