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Design Encrypted Voice transmission system on the phone line

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ntc78

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encrypted phone line

I am going to design a system to transceive the voice signal which is digitalized and encrypted for security . In my way, I am get analog singal (voice) through the CODEC block then compress it (using Vocoder ). After that I encrypt this digital signal. Thirdly, modulate this signal then transmit over the line.
So anyone can show me some ideas, suggestions or tips for my work such as:

Thank you so much
 

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