The 2018 International Symposium on Information Theory and Its Applications (ISITA2018)
On the Secrecy Capacity of 2-user Gaussian Interference Channel with Independent Secret Keys
Aditya Sinha, Parthajit Mohapatra, Jemin Lee, Tony Q.S. Quek,
This paper considers the problem of secure communication over a 2-user Gaussian interference channel (GIC) with shared key of finite rate between the transmitter-receiver pair with strong secrecy constraint at the receiver. The main contributions of the paper lies in obtaining a novel achievable scheme which uses a combination of one-time pad, stochastic encoding and superposition based coding scheme, and outer bound on the secrecy capacity region of the 2-user GIC. The main novelty of the derivation of the outer bound lies in the selection of the side-information to be provided to the receiver and using the secrecy constraints at the receiver. The results highlight the role of secret key in the encoding of messages to enhance the system performance in interference limited scenarios.