Rekeying in secure mobile multicast communications

摘要

A method of inter-area rekeying of encryption keys in secure mobile muiticast communications, in which a Domain Group Controller Key Server (Domain GCKS) distributes Traffic Encryption Keys (TEK) to a plurality of local Group Controller Key Servers (local GCKS), and said local Group Controller Key Servers forward said Traffic Encryption Keys, encrypted using Key Encryption Keys (KEK_i, KEK_j) that are specific to the respective local Group Controller Key Server (local GCKS_i, GCKS_j), to group members, said local Group Controller Key Servers (GCKS_i, GCKS_j) constituting Extra Key Owner Lists (EKOL_i, EKOL_j) for group key management areas (area_i, area_j) that distinguish group members (MM_i, MM_j) possessing Key Encryption Keys (KEK_i, KEK_j) and situated in the corresponding group key management area (area_i, area_j) from group members (MM_ij) possessing Key Encryption Keys (KEK_i) that were situated in the corresponding group key management area (area_i) but are visiting another area (area_j).