Cryptanalysis of the Enigma
Cryptanalysis of the Enigma ciphering system enabled the western Allies in World War II to read substantial amounts of Morse-coded radio communications of the Axis powers that had been enciphered using Enigma machines . 
<triplet> Allies <subj> World War II <obj> participant in <triplet> World War II <subj> Allies <obj> participant <subj> Axis powers <obj> participant <triplet> Axis powers <subj> World War II <obj> conflict