asp graphics code validation code verification principle : generate authentication code in the picture, while a generation of Session, and its value is verified codes in the picture digital value. While providing input box allows users to input, submitted the import value, and there's value Session, According to judge the outcome accordingly judgment.

Packet : 85375522asp_pic.rar filelist
imgchk
imgchk\validatecode.asp
imgchk\validatebody.fix
imgchk\validatehead.fix
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