：验证码图片是论坛类网站用以阻止自动化程序恶意行为的重要人机区分技术，其设计和实用安全性直接涉及到互联网的正常使用。

为研究国内验证码实用安全性，设计实现一种验证码识别算法模型，对国内的论坛验证码类型进行了实验和分析。实验结果表明，实用中

的验证码识别率通常在50％以上，某些甚至达到100％，难以起到对自动化程序的阻碍作用。从实用角度将验证码分为4类，发现最佳的

一类基本是空白的，表明验证码实用技术还应做较大改进。-: Verification code image is a forum type site to stop the malicious behavior of automated processes important distinction between human-computer technology, design and practical safety directly related to the normal use of the Internet. Practical verification code for the study of domestic security, designed to achieve a verification code recognition algorithm model, the domestic forum of the type of experimental verification code and analysis. Experimental results show that practical verification code in the recognition rate is usually above 50 , some even up to 100 , it is difficult to play the role of automated procedures hindered. Verification code from the practical point of view will be divided into four categories and found that a class is basically the best blank, indicating that the Code should also do more to improve practical skills.