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The written word is considered the most significant invention in human history, leading to the need for cryptography to conceal information. The term "cryptography" originates from the Greek word for hidden writing. Some of the earliest secret writing methods were used in ancient Greece, such as a technique described by Herodotus, where messages were inscribed on a wooden board and covered with wax during the 5th century BC for military communication. This method, known as steganography (covered writing), was widespread in the ancient world. However, it posed a significant risk: if discovered, the message could be easily deciphered. This limitation led to the development of more secure cryptographic methods.
