Encryption has a long and illustrious history. In World War II, the Americans and the British broke the German Enigma code and the Japanese Purple code, and those two events led to the downfall of Hitler's U-boat campaign in the Atlantic and Japanese troop movement throughout the Pacific Theater.
Today, encryption is found mainly in the movement of data. As data is to be transported, it is encrypted. Upon arriving at its destination, it is decrypted. During flight (i.e., the time that it is being moved), the message is deemed to be safe because if anyone were to encounter it, it would mean nothing. Only at the source and the destination is the data's true meaning apparent. This process is known as encryption in flight.
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