Zte Corporation

Yunwen Zhu

Tian Hao Tian

Yinxing Wei

Zhimeng Teng

Feng Gao

Tian Tian

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 called response party; and performing a secure media session between the calling party and the called response party with the identical media key.

Method and system for realizing secure forking call session in IP multimedia subsystem

A method for transmitting deferred media information in an Internet Protocol (IP) multimedia subsystem (IMS) includes: a sending party of the media information sends a key generation parameter encrypted with a Ka to a mailbox application server of a receiving party of the media information, the mailbox application server stores or saves the encrypted key generation parameters, and sends the encrypted key generation parameters to a key management server (KMS); the KMS generates a media key K and forwards it to the sending party through the mailbox application server of the receiving party; the receiving party obtains the encrypted key generation parameter from the mailbox application server and sends it to the KMS; the KMS generates the K and sends it to the receiving party; the receiving party decrypts the encrypted media information by using the K. A corresponding system is also disclosed. The method and system decrease signaling interaction between the sending party and the KMS, reduce the storage pressure of the KMS; realize the end-to-end secure transmission of the deferred media in the IMS.

Method and system for transmitting deferred media information in an IP multimedia subsystem

The present invention discloses a method for obtaining key management server information, and an intercepting method, system and device, including: in the process of a user equipment registering an IP multimedia subsystem (IMS), storing the KMS information corresponding to the user equipment in a preset IMS core network network element; and when a lawful intercepting device monitors a session initiated by the user equipment, intercepting a session request signaling sent by the user equipment, and obtaining an identification information of the user equipment from the session request signaling, and searching the KMS information corresponding to the user equipment from the preset IMS core network network element according to the identification information of the user equipment. The technical solution of the present invention makes the requirement of lawful intercepting be met without depending on security of the signaling plane when a plurality of KMSs are deployed in the IP multimedia subsystem.

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Shenzhen, China

Yunwen Zhu