| 摘要 |
The present invention discloses a method for transmitting deferred media information in the IP Multimedia Subsystem: the sending party of the media information sends key generation parameters encrypted with s Ka to the mailbox server of the receiving party of the media information; the mailbox server 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 the K to the sending party through the mailbox server of the receiving party; the receiving party obtains the encrypted key generation parameters from the mailbox server, and sends to the KMS; the KMS generates the K and sends the K to the receiving party; the receiving party decrypt the encrypted media information by using the K. The present invention also discloses a corresponding system. The present invention decreases the signaling interaction between the sending party and the KMS, reduces the storage pressure of the KMS, and realizes the secure transmission of the deferred media in the IMS. |
