This library generates 256x64 images with four random unicode character.

CAPTCHA is a type of challenge-response test used in computing to ensure that the response is not generated by a computer. Most captcha library is designed for website with script language like PHP or JSP. libcapt is writen by c++ language and designed to be as fast as possible. It can be used in MMORPG game server. libcapt have a gui tool(captUtil) to generate special font file(cpf file) used by libcapt. The cpf file is small and simple.

libcapt is portable and can be compiled at windows and linux, enjoy it!