Security system for accessing virtual private network service in communication network and method thereof

摘要

The present invention relates to a security system for accessing a private network service in a communication network and a method thereof, in which if a request of a subscriber for accessing a private network service is sensed, layer 2 tunnel protocol (L2TP) requests the virtual private network service access to a remote authentication dial-in user service server, and according to the request for accessing the private network service, the remote authentication dial-in user service server transfers layer 2 tunnel protocol (L2TP) information on layer 2 tunnel protocol (L2TP) network connected to the virtual private network, and pre-designated secret information in the layer 2 tunnel protocol (L2TP) network server to the layer 2 tunnel protocol (L2TP) access concentrator, and finally, after receiving the information on layer 2 tunnel protocol (L2TP) network and the secret information, the layer 2 tunnel protocol (L2TP) access concentrator performs encryption on the data generated by the subscriber by using the secret information, and transferring the encoded data to the layer 2 tunnel protocol (L2TP) network server.