This Machine Created Hard-to-Crack Codes in WWII

This page is the CodyCross answer for the clue below from Past and Present Tech, Group 1449, Puzzle 4 (Air Conditioning).

Question is: This Machine Created Hard-to-Crack Codes in WWII

and the answer is: ENIGMA

Word Meaning:

ENIGMA — Something or someone puzzling, mysterious or inexplicable.

Definitions from Wiktionary.

This Machine Created Hard-to-crack Codes In WWII - Past and Present Tech CodyCross Answers | CodyCross Solutions