MULTICAST KEY NEGOTIATION METHOD SUITABLE FOR GROUP CALLING SYSTEM AND RESPECTIVE SYSTEM Russian patent published in 2014 - IPC H04L9/32 H04W12/04 G06F21/60 

FIELD: physics, computer engineering.

SUBSTANCE: invention relates network security and particularly to a method and a system for multicast key negotiation method suitable for a group calling system broadband access technology SCDMA (synchronous code division multiple access). The technical result is achieved due to that a user terminal (UT) negotiates a unicast key with a base station (BS), derives an information encryption key and an integrity verifying key according to the unicast key, and registers a service group identifier that the UT belongs to at the BS; the BS notifies the UT the multicast key of the service group that the UT needs to apply, constructs a multicast key notification packet, and sends it to the UT; after receiving the multicast key notification packet sent by the BS, the UT obtains the multicast key of the service group that the UT needs to apply by decrypting a service group key application list, constructs a multicast key confirmation packet, and sends it to the BS; the BS confirms that the multicast key of the UT service group is built successfully according to the multicast key confirmation packet sent by the UT.

EFFECT: more secure group call service provided through multicast.

8 cl, 1 dwg