[GreenKeys] Slightly OT - Churchill War Room

[Duncan Brown]

On 3/31/2019 11:31, Doug Hensley wrote:
> Sigsally voice encryption predates functional teletype encryption.
>
There was TTY encryption during WWII in the form of the one-time-tape 
PYTHON/SIGTOT systems.  The AN/FGQ-1  originally mixed (XOR'ed) a 
physical "key" tape with the clear text tape to encrypt the message. 
Then the SIGCUM/ GORGON/ TSEC/KW-2 rotor machine replaced the physical 
key tape.

The AWA Museum, has a Teletype Corp. prototype (that came from the 
Teletype Corp. Museum) of a TSEC/KW-2/SIGCUM box with a tape reader 
added, which implies the mixing was done in the in the SIGCUM box. The 
NSA Museum has a production model of this prototype, but I haven't been 
able to get any more information about it from them. (Time to try again.)

During WWII, Teletype Corp. manufactured various encryption devices 
(including the off-line SIGABA) for the military.

73 & have fun,

Duncan Brown, K2OEQ
USASA    31J30

Antique Wireless Assoc. Museum,
   Asst. Curator, Commercial Equipment
(also chief TTY op & repairman)

www.antiquewireless.org