Re: your mail

[Phil Karn <karn@qualcomm.com>]

>> Hmm.  And if an attacker discovers you're using this method, and
>> decides to send out a signal on the same frequency?  You might find
>> your "random" numbers are suddenly all zeros...

>Band hop. Build a variable modulo counter and use its output to reset its 
>modulo and hop the band around pseudo-randomly. Unless they know or stumble
>on the particular design you are using it will be very difficult to track.

An even better idea: disconnect the antenna. Most of the noise comes
from the front end amplifier, not the galactic and cosmic background,
at least in your average consumer grade receiver. And this is a quantum
process that someone else definitely can't predict or copy.

Phil