Re: suggestions needed: agent to local hq, using MW or FM band to transmit information
From: Michael Amling (nospam_at_nospam.com)
Date: 03/31/05
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Date: Thu, 31 Mar 2005 13:36:37 GMT
Max Power wrote:
> How can an agent contact a local HQ using a MW or FM band transmitter and
> primitive signalling (like polytone or even Morse code) using the most
> primitive of equipment.
>
> For MW transmission, frequencies in-between local high power carrier waves
> seems to be safer with respect to escaping detection as most receivers are
> digital these days and cannot tune in-between channels. The same concept
> applies to FM, albeit I suspect that only Morse code would be used to keep
> the transmission 'narrowband'.
Modern FM tuners, even pre-digital, lock on to the strongest of
several signals at a give frequency. Casual FM listeners won't hear your
agent's broadcast unless it's so close that it's the strongest signal. I
expect there are tricks that HQ can use to extract your agent's signal.
> I am assuming some crypto comes into play, but 'simple' hard crypto is
> preferred conceptually.
You can encipher your message into alphabetic ciphertext, then send
the ciphertext using Morse code.
--Mike Amling
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