[GreenKeys] Parallel TTY

[Duncan Brown]

Nick,

Thanks for the link to Boak lectures.

Lots of times, what seems like a good idea, turns out not to be 
practical, or too expensive for the problem it solves.

Boak says (p10) that when he started out at NSA:
"I devised many a gloriously im­practical system and was confused and 
dismayed when these magnificent products were some­ times rejected in 
favor ·of some clearly inferior- that is, less secure system merely 
because the alternative was simpler, or faster, or cheaper; or merely 
because it would work."

Thanks,

Duncan
K2OEQ

On 01-Apr-21 11:40, Nick England wrote:
> There’s an interesting NSA crypto history document at
> https://www.archives.gov/files/declassification/iscap/pdf/2009-049-doc1.pdf 
> <https://www.archives.gov/files/declassification/iscap/pdf/2009-049-doc1.pdf>
>
> In lecture 10 on TEMPEST, there is discussion of attempts to reduce 
> emissions from TTY gear. One attempt was to make all the bits change 
> at the same time and another involved 10 wires (differential signaling 
> I presume).
>
> Model 28 parallel signal (multiple contact) tape reader units are 
> pretty well known (LBXD for example), but I haven’t ever seen a M28 
> parallel signal keyboard except for the Compact KSR which has a M32 
> keyboard.
>
> Of course it may just have been a back room prototype or ???
>
> Cheers
> Nick
> -- 
> Nick England K4NYW
> www.navy-radio.com <http://www.navy-radio.com>
>
> ______________________________________________________________
> GreenKeys mailing list
> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:GreenKeys at mailman.qth.net
>
>>>> Jordan Spencer Cunningham's GreenKeys Search Tool: https://teletype.net/gksearch
>>>> 2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
>>>> 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
>>>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to duncanancy at earthlink.net