How did cryptography change or impact the course of history in the civil war?

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Cryptography was very important in the Civil war due to the advent of the telegraph and Morse code. Since anyone could listen in on a message as it passed between two points it was imperative to either secure the lines (not always possible) or to encode the message.

First answer by Ilantoren. Last edit by Ilantoren. Contributor trust: 391 [recommend contributor recommended]. Question popularity: 36 [recommend question].