security management. The exchange of information between access Controller and control hosts is done via Ethernet, delivering content easily intercepted and analyzed, this need to ensure the security that information transfers, including the following:The confidentiality of user authentication. The access controller sends user authentication to the control host, needs for user authentication is encrypted, so even if the related message was intercepted can not easily analyze user authentication, to prevent the user identity to be imitated;The open door command of the host is not forged. Malicious users can not open the door by intercepting and analyzing the original message format, forged a new open host control
command;Mutual authentication between the access controller and the host. Both can accurately identify whether the content of messages sent each other, even if a malicious user to fake IP addresses, etc. can not deceive.