Patent ID: 8855315
Filing Date: 2014-10-07
Classification: H04L

Abstract:
1. A method for realizing a secure forking call session, comprising: performing authentication between a calling party and a Key Management Server (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 IP Multimedia Subsystem (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; forwarding a message encrypted by the KMS containing the media root key and the generated random number by a called response party in the called parties, who responds to the call, to the calling party through the IMS network, wherein the message from the KMS to the called response party is encrypted with the shared key between the KMS and the calling party; 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.