使用md5加密的NTLM Flex客户端身份验证

I have flex client application with php as a server and i want to implements domain user and password authentication. I'm sending the user and the password from the flex client through httpservice to php script and the php script authenticate the user and the password with the domain But! I want to encrypt the user's password in flex and to decrypt it in the php. I have the as3crypto.swc module for the flex but I don't find any way to decrypt it in the php. So, how can I do that and If this is not the right way to do that how can I do that? Any help? Regards. elad.I have flex client application with php as a se