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The written word is regarded as the most important invention in human history, while the need to conceal information led to the invention of cryptography, derived from Greek meaning "hidden writing." Early forms of secret writing appeared in ancient Greece; for instance, Herodotus described a method of hiding messages by writing on a wooden board and covering it with wax during the 5th century BC Persian wars. This technique is known as steganography, or "covered writing," and was prevalent across the ancient world. However, its main flaw is that if the message is discovered, its content can be easily revealed, which prompted the development of cryptography that provides more secure means of concealing messages.
