[Milsurplus] Re: [ARC5] NPC: A Tune for Pearl Harbor Day

[Tom Norris]

Wikipedia does a decent description.


There is an exhibit of the system at the NSA museum

http://www.nsa.gov/museum/museu00022.cfm

Tom  NU4G


On Dec 7, 2007, at 3:50 PM, Gene Smar wrote:

> Gents:
>
>     All this talk about military radio and early recordings  
> reminded me of SIGSALY.  This was the encrypted voice HF system  
> that linked WWII personnae such as FDR, Churchill, MacArthur and  
> others of similar ilk.  The primitive PCM-encoded voice signals  
> were then encrypted by using an audible random-noise generator  
> source that was pressed onto recording disks in pairs and  
> transported to opposite ends of the links.  A matched pair of these  
> recordings was used as a one-time encryption pad for HF  
> conversations between principals.
>
>     The Wiki source (Caveat Amateur)  http://en.wikipedia.org/wiki/ 
> SIGSALY shows several links to NSA web pages and others on this  
> facinating subject.
>
>     FWIW.
>
>
> 73 de
> Gene Smar  AD3F
> P.S.  The technology was kept secret until 1976.
>
>