The scytale is known as the first cryptographic device, used in 400 B.C. by the Spartans. It consisted of a baton and a papyrus strips with letters. These papyrus strips would only reveal the message sent between Spartan generals if the baton they were wrapped around had the same dimensions as the one that the message was written on.
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Sparta, “Scytale,” Ciphers and Encryption, accessed May 15, 2021, https://crypto.omeka.net/items/show/16.