To encrypt messages, John and Jane used Scytale.Scytale is a tool used to perform a transposition cipher, consisting of a cylinder with a strip of parchmentwound around it on which is written a message. The ancient Greeks, and the Spartans in particular, are saidtohave used this cipher to communicate during military campaigns. The recipient uses a cylinder of thesame diameter on which the parchment is wrapped to read the message.