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The written word is considered the most significant invention in human history, leading to the simultaneous need to conceal information, resulting in the invention of cryptography. The term "cryptography" originates from Greek, meaning "hidden writing." Ancient Greece had some of the earliest forms of secret writing, with Herodotus describing a method of concealing messages by writing on a wooden board and covering it with wax during the 5th century BC, particularly in military communications. This form of concealment is known as steganography (covered writing), which was common in ancient cultures from Greece to China. However, steganography posed security issues, as revealed messages could be easily deciphered, leading to the development of cryptography.