Traffic encryption key management for machine to machine multicast group
AssigneeLG Electronics Inc.
InventorsIn Uk Jung, Jin Sam Kwak, Ki Seon Ryu, Wook Bong Lee
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Abstract
A method for updating a group traffic key used for encrypting and decrypting multicast data in a wireless communication system is described. The method includes receiving, from the base station, a first message comprising a new group security seed; and updating the group traffic key based on the new group security seed.
Claims6
A method for updating a group traffic key used for encrypting and decrypting multicast data in a wireless communication system, the method performed by a mobile station comprising:
- receiving, from a base station, parameters for generating the group traffic key through a Dynamic Service Addition (DSA) transaction, the parameters comprising an identifier of a group and a group security seed which is a first random value generated by the base station;
- generating the group traffic key based on the group security seed in the parameters;
- decrypting multicast data using the group traffic key;
- receiving, from the base station, a paging advertisement (PAG-ADV) message comprising a new group security seed which is a second random value newly generated by the base station;
- and
- updating the group traffic key based on the new group security seed,
- wherein the generating or the updating the group traffic key is performed by following equation
- MGTEK<=Dot16KDF(MAK, MGSS|M2MGTEK_COUNT|MGID|‘MGTEK’, 128) [equation].
A mobile station for updating a group traffic key used for encrypting and decrypting multicast data in a wireless communication system, the mobile station comprising:
- a wireless communication unit configure to transceive wireless signal to and/or from the outside;
- and
- a controller connected to the wireless communication unit and configured to:
- receive, from a base station, parameters for generating the group traffic key through a Dynamic Service Addition (DSA) transaction, the parameters comprising an identifier of a group and a group security seed which is a first random value generated by the base station;
- generate the group traffic key based on the group security seed in the parameters;
- decrypt multicast data using the group traffic key;
- receive, from the base station, a paging advertisement (PAG-ADV) message comprising a new group security seed which is a second random value newly generated by the base station;
- and
- update the group traffic key based on the new group security seed,
- wherein the generating or the updating the group traffic key is performed by following equation
- MGTEK<=Dot16KDF(MAK, MGSS|M2MGTEK_COUNT|MGID|‘MGTEK’, 128) [equation].
Dependencies are inferred from the claim text.