Patent ID: 9258705
Filing Date: 2016-02-09
CPC Classification: H04L,H04W

Claim Text:
1. A method of operating a subscriber station, the method comprising: performing a network entry procedure through a base station (BS); receiving multicast service authentication information comprising a machine-to-machine (M2M) service group security seed from the BS during the network entry procedure; generating a multicast data encryption key based on the multicast service authentication information; and communicating data with the BS based on the multicast data encryption key, where, MGTEK: multicast data encryption key, MAK: M2M service authorization key, MGSS: M2M service group security seed, Key_counter: index of the currently used MGTEK, MGID: multicast group identifier, “MGTEK”: character string representing that it is multicast data encryption key, and Dot16KDF: algorithm of generating multicast data encryption key of 128 bits that inputs M2M service authorization key, M2M service group security seed, and multicast group identifier.