Secure Multi-Antenna Coded Caching

Mohammad Javad Sojdeh, Mohammad Mahmoudi, Mehdi Letafati, Seyed Pooya Shariatpanahi, Babak Hossein Khalaj

Abstract: This paper considers a wireless Multi-Input Single-Output Broadcast (MISO-BC) setup where a base station with L antennas is connected to K end-users through a broadcast channel. We explore the secure multi-antenna coded caching scheme in a centralized manner. Our goal is to prevent an eavesdropper who sniffs the packets in the delivery phase from obtaining any information about the original files. We analyze the system’s performance in terms of Coding Delay and guarantee the security using the Mutual Information metric. The numerical evaluations show that security leads to a negligible cost in terms of memory by scaling up the files and users and it does not impose extra computational complexity on the network. Finally, we present some numerical evaluations to investigate the scheme.