But how much of that was due to HUMINT? The German plugboard-equipped Enigma became the Third Reich's principal crypto-system. It was reconstructed by the Poli

But how much of that was due to HUMINT? The German plugboard-equipped Enigma became the Third Reich's principal crypto-system. It was reconstructed by the Polish General Staff's Cipher Bureau in December 1932—with the aid of French-supplied intelligence material that had been obtained from a German spy. [1] I guess we could go on and on over which was thus more important. But it must be acknowledged that, at least, HUMINT is extremely important, and can't be discounted. [1] https://en.wikipedia.org/wiki/Cryptanalysis_of_the_Enigma https://en.wikipedia.org/wiki/Cryptanalysis_of_the_Enigma