Secure Open Fronthaul Interface for 5G Networks

The open fronthaul interface is a standard protocol for a link between the radio units and the distributed unit in RAN, enabling different vendors interoperable. We study the security requirements of the open fronthaul interface for 5G networks. The O-RAN management plane (M-plane) mandates an end-to-end security using SSHv2, whereas the O-RAN control and user plane (CU-plane) do not support any security measure yet. We investigate MACsec for the CU-plane security, which is recommended as one of security options in the eCPRI specification. Furthermore, we implemented quantum-safe crypto solutions using a hybrid mode key exchange and signature schemes, which can be applied for the post-quantum SSH and MACsec protocols.