Query on Early NSA Crypto Patents

[John Young]

Three formerly secret patent applications for crypto machines 
by William Friedman (filed 1933 and 1936) and Laurance Safford 
and Donald Seiler (filed 1944) were issued as patents in 2000 and 
assigned to the National Security Agency.

  http://cryptome.org/nsa-patents/friedman-1933.htm

  http://cryptome.org/nsa-patents/friedman-1936.htm

  http://cryptome.org/nsa-patents/safford-1944.htm

Friedman's patents refer to his earlier patents in 1925 and
1936 which are available as images only at the US Patent 
Office.

It has been suggested that the patents refer to the Sigaba 
machine. Opinion on whether this true or the devices
shown are other models is invited.



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