Secure FM

Description

In your laboratory, an old veteran explains that you don’t need cryptography to protect a radio signal, and that fast frequency hopping is unbreakable. What do you think?

Here you have a GNURadio graph and the resulting signal.

Note: The file is in IQ format, which is GNURadio’s usual output format. Several other tools can read this file format, such as Inspectrum, Gqrx, Universal Radio Hacker, …