Security method and system of mobile

The present invention relates to a security method and system for a mobile terminal. The disclosed technology, in the security method for a mobile terminal, (a) the mobile terminal but passes the security ID and a first authentication code of the mobile terminal to the content server, the first authentication code, the service key, the mobile station step has a value which is calculated by using the ID and the security ID of the ID, a set-top box; (B) step of the content server extracts the ID of the mobile station from the Secure ID and ID list, and transferring the extracted the identity of the mobile terminal to an authentication server; (C) transferring the service key is the authentication server that is calculated by using the above extracted ID of the mobile terminal to the content server; And (d) authenticating the first authentication code is calculated by using the ID, wherein the ID and the security ID of the mobile station extracts the content server of the said service key, the set-top box.