Cryptographic DSSS sequence

Spread Spectrum is a system to spread the signal power over a large frequency band, hiding the signal itself and protecting it. Reconstructing the original signal needs the knowledge of the spreading sequence. The resulting signal is more difficult to find and intercept, to jam or to spoof. If the DSSS sequence is protected by a cryptographic sequence, a cryptographic key is needed to predict the spreading sequence's behavior. ^[1]