Would it be possible to create an Over-The-Top communication utility that will e

Question

Would it be possible to create an Over-The-Top communication utility that will encrypt voice using format preserving encryption (voice clear-text to audio encrypted stream) and send that over an existing channel (e.g. Skype/ Cellular)?

I was wondering if the FPE could be made to take such a form that the compression algorithms used in VoIP would not be able to compress and would be forced to send all the analog signal (the encrypted voice message).

As I understand the voice compression algorithms work by cutting off sounds over a certain frequency, so if the encrypted "sound" would be 100% in the "don't truncate" part of the sound spectrum the voice codec would have no way of compressing and default to send the entire thing.

Explanation / Answer

The answer depends on how you would layer the encryption on top of the existing protocol.

1. If you implemented your own Skype client, you could deal with compression issues yourself. That might allow you to use format preserving encryption, perhaps on the compressed data stream and not the audio itself.

However, you would need to be careful

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