[GreenKeys] Here's a sweet one on the bay.

[Jeffrey D Angus]

On 5/16/2013 10:41 PM, hwhall at compuserve.com wrote:
> "*The US Army Signal Corp's teletype typewriter... was the US equivalent to the
>
> famous German enigma machine. "
>
> Both were clever & complex machines but served entirely different purposes.*
Quite right. A teletype machine is just a teletype machine. It
relies on an encryption device to create "secret" messages.

Typical sequence was:
1. generate secret message in plain text.
2. use crypto machine to convert to secure text.
3. send secure text via teletype machine.
4. receiver secure message via teletype machine.
5. decode message with crypto machine.
6. hand secret message in plain text to the person that needed it.

Two examples of the machines used by "our side" (The US) during
World War II.
The M-209. Secure enough for most time sensitive stuff.
<http://www.cryptomuseum.com/crypto/hagelin/m209/index.htm>
And the SGIABA for stuff that needed to STAY secret.
<http://www.cryptomuseum.com/crypto/usa/sigaba/index.htm>

Jeff-1.0
wa6fwi

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