Patent ID: 8705745
Filing Date: 2014-04-22
Classification: H04L

Abstract:
1. A method for transmitting deferred media information in an IP Multimedia Subsystem, comprising: a sending party of the media information sending key generation parameters encrypted by using a Ka to a mailbox server of a receiving party of the media information; the mailbox server saving the encrypted key generation parameters, and sending the encrypted key generation parameters to a Key Management Server (KMS), wherein the Ka is a shared key of the sending party and the KMS; the KMS obtaining the key generation parameters through decryption using the corresponding Ka, generating a media key K with the key generation parameters, and forwarding the K to the sending party through the mailbox server of the receiving party; the receiving party obtaining the encrypted key generation parameters from the mailbox server, and then sending the obtained encrypted key generation parameters to the KMS; the KMS obtaining the key generation parameters by using the Ka to decrypt the encrypted key generation parameters sent by the receiving party, and then generating the K with the key generation parameters and sending the K to the receiving party; and the receiving party obtaining the media information encrypted by the sending party with the K from the mailbox server, and then decrypting the encrypted media information by using the K.