Re: Space is big, signals are weak
Furthermore, they would probably switch to digital equally quickly and then start encrypting everything routinely, for commercial reasons if not for anything else. And a well encrypted transmission looks pretty much like random noise.
That's any well-coded signal, ie coded to make efficient use of available bandwidth. The main difference between encryption and "mere" efficient coding, is whether you publish the decoding algorithm and key(s), or not!
Biting the hand that feeds IT
