[GreenKeys] Fwd: Interesting cipher machine.

[Duncan Brown]

-------- Forwarded Message --------
Subject: 	Re: [GreenKeys] Interesting cipher machine.
Date: 	Thu, 10 Feb 2022 15:59:22 -0500
From: 	Duncan Brown <duncanancy at earthlink.net>
To: 	Michael Katzmann <vk2bea at gmail.com>



Michael,

Thanks for the link!!

I was not aware that NCM had a youtube channel - looks to be new.

The TTY in there is a TT-30/AGA-1 (aka Teletype Corp. Model 31). The box 
is a portable TTY and (SIGABA-type) encryption unit in one.  Never seen 
this version, but description enclosed.  There is a picture (enclosed) 
of the communications position of President Truman's VC-118 aircraft in 
1947 using a similar unit.  (note the AN/ART-12 modified for RTTY on the 
shelf above.)

The original  "SIGABA" machine did not include a TTY.  It had a keyboard 
and just generated the encrypted signal typed onto a paper tape to be 
sent out over voice, CW or TTY. Later, there were modifications or 
adapters to generate the 5-bit TTY code directly. SIGABA was 
manufactured by Teletype Corp. for the government.

  I believe the proper nomenclature for the AFSAM 4A was "SIGNIN" and 
"M-294"

Thanks  & have fun,

Duncan
K2OEQ



On 10-Feb-22 12:49, Michael Katzmann wrote:
> https://www.youtube.com/watch?v=bODkOdBLJbU&t=1s 
> <https://www.youtube.com/watch?v=bODkOdBLJbU&t=1s>
>
> Has anyone seen one of these in the wild?  (I presume they all get 
> destroyed upon retirement)
>
> Michael
>
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US UK Comm Security Equip c1952.pdf  p.12

SECTION A;  U. S. COMMUNICATION SECURITY EQUIPMENT

PART II. TELEPRINTER SECURITY EQUIPMENTS

3. Non-Synchronous with Electro-Mechanical Crypto-Components


AFSAM 4A (SIGNIN)

	A combined teletypewriter and cipher machine. An eight rotor
maze produces five levels of key which are added baud by baud
to the plaintext to accomplish encryption. May be operated on-line
or off-line. Unit is mounted in a specially designed three-combination
safe. For PANDORA operation, impulses travel through maze from left
to right to produce five elements of key simultaneously. Rotor 1 is
fast and controls Rotor 2; Rotor 2 controls Rotor 3; Rotor 3 controls
Rotor 4; a mixed-wired stator is located between Rotors 4 and 5;
Rotor 5 is fast; Rotor 6 is controlled by Rotor 7; Rotor 7 is controlled
by Rotor 8; Rotor 8 is fast. For BALDER operation, impulses
travel through maze from right to left and are reflected back to the
right end-plate to produce the five levels of key. Rotors 1, 2, 3, 4,
6, 7, and 8 move as in PANDORA; Rotor 5 is a "bump" rotor, controlled
from one of the end-plate contact positions; a mixed-wired stator is
located between Rotors 4 and 5.

Size and Weight:  22 1/2" X 25 3/8" X 17"; 252 lbs.

Production Status:  Approximately 450 machines have been produced.

Radiation: Extent of spurious radiations from this equipment
has not been determined.