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We propose a physical-layer encryption scheme inspired by Diffie's telephone system. Instead of the usual XORthen-modulate encryption scheme, we propose using modulatethen-add, and show that the decryption operation can be implemented using the circuit operation of heterodyning. We then show that a slightly modified superheterodyne receiver performs decryption at no additional cost compared to existing receivers. Our proposed cryptosystem is significant to the research community for thedoi:10.1109/milcom.2013.87 dblp:conf/milcom/ChiangH13a fatcat:5ppxtog4hfbwxkflbm7vwmygoe