[GreenKeys] More 28ASR K-KT-T madness

[Duncan Brown]

Nick, Ralph,

As a TTY repairman in the Army, I worked with KW-7 & KW-26 and they did 
not need to step the tape readers. We never used the stepping feature, 
anyway. (I know the KW-7 does have a stepping control output, but maybe 
only to be backwards compatible?)

I think the stepping control was required for the older, mechanical 
crypto equipment, like the KL-7/-47. They were off-line machines, but 
there were adapters to allow a TTY tape message to be fed into the 
crypto unit. One was the TSEC/HL-1, which was only rated at 50 wpm 
(CSP-6620A).  The TT-36/GGA-1 (which we have discussed before) was maybe 
an earlier version of the HL-1.

-...-


As  for TEMPEST, here is the original (declassified) NSA history of it: 
https://www.nsa.gov/Portals/70/documents/news-features/declassified-documents/cryptologic-spectrum/tempest.pdf

More TEMPEST info at 
http://hackaday.com/2015/10/19/tempest-a-tin-foil-hat-for-your-electronics-and-their-secrets/

Have fun,

Duncan



On 2/19/2020 08:20, Nick England wrote:
> There were TSEC/KW-7 crypto units aboard and I know that had a step 
> pulse output to synchronize the TTY characters.
>
>