![]() ![]() In figure 1 on the left, all the voice signal frequencies at 300Hz are inverted to 3kHz. Inversion scrambling inverts the frequencies and volume of the voice signal. There are several different methods for encrypting voice signals.įig. Therefore, all radios communicating must have matching encryption keys to receive transmissions. The encryption key is used by the transmit and receive radios to enable the voice signal to be coded and decoded for both radios. This algorithm is controlled by an encryption key. In two-way radios, encryption modifies a voice signal using a coding algorithm. Encryption is the process of encoding information (in this case audio signals) in such a way that eavesdroppers or hackers cannot understand it, but authorized parties can access it.
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