A METHOD FOR ENSURING THE SAFETY OF THE MEDIA-FLOW IN IP MULTIMEDIA SUB-SYSTEM

摘要

A method for ensuring the safety of the media-flow in IMS is: the network device registered by the calling UE or called UE in IMS network allocates the media-flow safe key of end-to-end to the calling UE or called UE, and the network device that allocates the key sends the media-flow safe key to the network device that the opposite side belongs to through the session messages; the network device of the said calling US or called UE encrypts the said media-flow safe key using the session key shared with the user terminal respectively, and transmits it to the calling UE or called UE through the session messages respectively; the calling UE and called UE decrypt the media-flow safe key of end-to-end using the session key shared with the network device that they belong to respectively, and encrypt or decrypt the media-flow using the key.