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Before the Second World War ended, the direction of people's research was how to use replacement and displacement to prevent password dictionary or the leakage of encryption mechanism, but increasing more replacement and displacement is bound to intensify the difficulty of encryption and decryption, as well will increase the possibility of operators making mistakes, therefore the German military at the time invented a special machine dedicated to decryption, that is called -- "Enigma".

The Enigma machine was used broadly by the German military in the 1940's. "Enigma" had a few major advancements, in addition to using machines to replace manual operations, another main point is that passwords are no longer decryptable simply using observations of words or vocabulary. (Wikipedia: Enigma machine)

The advancements of the World War II calculator, (aka the computer) and electronics caused changes in the ways of encryption. Since the computer may encrypt any saved documents, plus most computers encrypt based on binary string, unlike classical cypher which used original letters, numbers, and linguistics-based decryption, therefore, failed for that.
To not use frequency analysis to crack a message, you must know what kind of encryption method used currently, thus brought about activities of spying, bribing, burglary, or betrayal. Only until the Nineteenth century where researchers finally understood that the operational analysis of encryption was irrational or gave actual protection.