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Consider impersonation attack by an active malicious nano node (Eve) on adiffusion based molecular communication (DbMC) system---Eve transmits duringthe idle slots to deceive the nano receiver (Bob) that she is indeed thelegitimate nano transmitter (Alice). To this end, this work exploits the3-dimensional (3D) channel impulse response (CIR) with $L$ taps as devicefingerprint for authentication of the nano transmitter during each slot.Specifically, Bob utilizes the Alice's CIR as ground truth to construct abinary hypothesis test to systematically accept/reject the data received ineach slot. Simulation results highlight the great challenge posed byimpersonation attack--i.e., it is not possible to simultaneously minimize thetwo error probabilities. In other words, one needs to tolerate on one errortype in order to minimize the other error type.

Channel Impulse Response-based Physical Layer Authentication in a Diffusion-based Molecular Communication System