Multi-Layer Secret Sharing for Cross-Layer Attack Defense in 5G Networks: a COTS UE Demonstration

This demo presents the first implementation of multi-layer secret sharing on commercial-off-the-shelf (COTS) 5G user equipment (UE), operating without infrastructure modifications or pre-shared keys. Our XOR-based approach distributes secret shares across network operators and distributed relays, ensuring perfect recovery and data confidentiality even if one network operator and one relay are simultaneously lost (e.g., under denial of service (DoS) or unanticipated attacks).