Abstract: The present invention relates to a method for realizing a secure forking call session, which comprises: performing authentication between a calling party and a KMS or between each called party and the KMS, and acquiring a shared key between the calling party and the KMS or a shared key between each called party and the KMS; generating a random number by the calling party and calling each called party through an IMS; generating a random number by each called party and acquiring a media root key from the KMS; generating a media key, which is shared with the calling party, by each called party according to the media root key and the random number generated by the called party; sending the media root key and the generated random number by a called response party in the called parties, who responds the call, to the calling party through the IMS network; generating a media key identical to that of the called response party by the calling party according to the media root key and the random number generated by the c

Abstract: An authentication method and an authentication system based on forking, and a forking authentication device are provided by the present invention.

Abstract: A method for monitoring a picture or multimedia video pictures in a communication system is provided. The method includes following steps: a monitoring node extracts a picture or multimedia video pictures from communication data; a preprocessing system divides the picture or multimedia video pictures into multiple parts, and executes hash calculation respectively to obtain hash value of each part; the preprocessing system processes multiple hash values to construct a single ID; a primary monitoring system searches a template base for the ID, the template base includes multiple items, and each item includes an ID and hash values of which the ID in the item is composed; if the ID is not found, the primary monitoring system searches the template base for each hash value respectively; and the primary monitoring system informs the search result to the preprocessing system and the monitoring node. The present invention improves the efficiency of monitoring a picture or multimedia video pictures in communications.

Abstract: The present invention discloses a method and system for supporting mobility security in a next generation network. In implementation of the method, a Transport Authentication and Authorization Functional Entity (TAA-FE) and a mobile agent functional entity are configured in the network, and a reference point for transmitting key material is established between the TAA-FE and the mobile agent functional entity; when a terminal moves, the mobile agent functional entity receives the key material from the TAA-FE, and performs security protection for signaling between the terminal and the mobile agent functional entity. The system comprises: a transport user profile functional entity, a TAA-FE, and a mobile agent functional entity. Applying the present invention, the mobility security on the transport layer in the next generation network is ensured.