[GreenKeys] Here's a sweet one on the bay. (crypto machines)

[gfmurphy at earthlink.net]

To make the discussion on the Greenkeys list of the SIGABA machine go
full circle, it is noteworthy that SIGABA, SIGCUM, the KL-7 and the 
KL-47 were all manufactured by Teletype Corporation.  It is very likely
that they manufactured other devices.  Take a look at Jerry Proc's page 
on the KL-47.  Here's the link:
   <http://www.jproc.ca/crypto/kl47.html>
You'll see the Teletype Corp. logo on some items and you'll also see
items with Teletype part numbers.

Jerry Murphy


-----Original Message-----
>From: Jim Haynes <jhhaynes at earthlink.net>
>Sent: May 18, 2013 6:15 PM
>To: Christian Gauger-Cosgrove <captainkirk359 at gmail.com>
>Cc: nagle at animats.com, greenkeys at mailman.qth.net
>Subject: Re: [GreenKeys] Here's a sweet one on the bay. (crypto machines)
>
>On Sat, 18 May 2013, Christian Gauger-Cosgrove wrote:
>
>>
>> During WWII, the US actually developed the "best" of the rotor cipher
>> machines; it did require power drive, and was rather large. It was the
>> SIGABA; which had a grand total of fifteen rotors, which were of the
>> "Enigma" style wire scrambler rotors. As I mentioned in a previous
>> e-mail; the SIGABA was not cracked until just a few years ago. At
>> least publicly; if the NSA found a way to break it, they kept mum
>> about that.
>>
>Also I've read that the U.S. issued new rotor sets once a year and had
>a spare rotor set in reserve in case the in-use set was compromised.
>Whereas Enigma got a couple of rotors added during the course of the
>war but the same ones were used throughout.