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This tutorial demonstrates encrypted digital voice communication over narrowband FM radio. It uses an open source codec to modulate digital voice with audio frequency shift keying. The voice portion of the frames is encrypted using AES 256 cipher in cipher feedback configuration which allows self synchronization in data loss. However, it is vulnerable to replay attacks. The transmitter is a Bao Fang murrs v1 radio and the receiver is an RTL SDR software-defined radio receiver. The communication is done on the unlicensed Murs radio band but may work on other bands like FRS and amateur bands, however, legality should be checked based on local laws.
