Voice over OTP during WW2.

[Steven M. Bellovin]

In message <F504A8CEE925D411AF4A00508B8BE90A91EB3E at exna07.securitydynamics.com>
, "Trei, Peter" writes:
>http://www.nsa.gov/wwii/papers/start_of_digital_revolution.htm
>
>Fascinating article at the NSA site about the 
>heroic efforts to provide long-distance secure voice 
>communications over radio.
>
>The good folks at Bell Labs essentially invented
>digitized, compressed voice, and encrypted it
>using synchronized pairs of records of
>random data at each end. Each terminal site
>had 55 *tons* of equipment!
>
>Apparently this astounding - and apparently 
>successful - effort was mostly declassified 
>back in '76, but I first heard about it in 
>Stevenson's Cryptonomicon last year.

There's an exhibit on this system in the War Room museum in London.


		--Steve Bellovin, http://www.research.att.com/~smb