Possibly O/T : "Enigma" post-war use in "third-world" countries

I am wondering whether there has been any papers/docs. released
in USA, or elsewhere, on the post-war sale & use of ENIGMA machines.
The only stuff that I have found are the usual, similar, sentences
( as below ), without any references.

Any pointers ( to public sources ) would be gratefully received.

Cheers,
Martin


http://en.wikipedia.org/wiki/Enigma_machine

It has been estimated that 100,000 Enigma machines were constructed, and
after the end of the Second World War, the Allies sold captured Enigma
machines, still widely considered secure, to a number of developing
countries...