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the written word is the most important invention in human history but as long as humans have had the ability to share information theyve also had the need to conceal that information as well this need led to the invention of cryptography the word cryptography comes from the greek meaning hidden writing and some of the earliest forms of secret writing come from ancient greece as well herodotus the father of history as he is known described a way of hiding writing by putting a message on a wooden board and then covering it with a layer of wax during greeces war with persia in the 5th century bc this approach was used to send military correspondents this sort of concealment is known as steganography meaning covered writing it was common all over the ancient world from greece to china but as you can probably guess this approach has some issues the main one being that if the message is discovered its contents will be easily revealed this dilemma gave rise to cryptography which doesnt hi
