KEY MANAGEMENT IN MACHINE TYPE COMMUNICATION SYSTEM

摘要

A MTC device (10) and a MTC interworking function, MTC-IWF, (20) form a communication system and conduct communication with each other. In this communication system, a root key (K_iwf) is securely shared between the MTC device (10) and the MTC-IWF (20). The MTC device (10) and the MTC-IWF (20) use the root key (K_iwf) to respectively derive temporary keys (K_di (K_di_conf, K_di_int)) for protecting the communication. The temporary keys provide integrity protection and confidentiality. The root key can be derived by the HSS or MME/SGSN/MSC and provided to the MTC-IWF. The root key can also be derived by the MTC-IWF based on received key derivation material. The described system is useful for the security of small data transmission in MTC system.

主权项

1. A communication system comprising:
a UE (User Equipment); and MTC-IWF Machine-Type-Communication Inter-Working Function) that conducts communication with the UE, wherein a first key is securely shared between the UE and the MTC-IWF, and wherein the UE and the MTC-IWF respectively derive second keys from the first key for protecting the communication between the UE and the MTC-IWF.