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this is a demonstration of encrypted digital voice communication over narrowband FM radio this demonstration uses the open source codec to digital voice codec which modulates digital voice using audio frequency shift keying I have modified it to encrypt the voice portion of the frames using an aes 256 cipher in a cipher feedback configuration which allows receivers to self synchronize in the presence of data loss however it is susceptible to replay attacks where an adversary captures and replays the encrypted communications without decrypting resistance to these attacks wasnt a design goal my transmitter is a Bao Fang murrs v1 radio my receiver is an RTL SDR software-defined radio receiver I am transmitting on the unlicensed Murs radio band which allows for data transmission and encrypted communications it should work with other bands such as FRS and amateur bands however digital or encrypted communications over these bands may be illegal check your local laws it should also work ove