
1) Classical cipher 2) Dune character
Found on
https://www.crosswordclues.com/clue/scytale

In cryptography, a scytale (iː, rhymes approximately with Italy; also transliterated skytale, Greek σκυτάλη `baton`) is a tool used to perform a transposition cipher, consisting of a cylinder with a strip of parchment wound around it on which is written a message. The ancient Greeks, and the Spartans in particular, are said to have used .....
Found on
http://en.wikipedia.org/wiki/Scytale
[Dune] Scytale l is a fictional character in the Dune universe created by Frank Herbert. In the novel Dune Messiah (1969), Scytale is a Tleilaxu Face Dancer who participates in the conspiracy to topple the rule of Paul Atreides. He later returns as a ghola and Tleilaxu Master in Heretics of Dune (1984) and Chapterhouse: Dune (1985). Finally...
Found on
http://en.wikipedia.org/wiki/Scytale_(Dune)

(from the article `cryptology`) ...and to enhance its significance when it was revealed. The first recorded use of cryptography for correspondence was by the Spartans, who as early ... ...and decipher messages. The first cipher device appears to have been employed by the ancient Greeks around 400 for secret communications between ... ...
Found on
http://www.britannica.com/eb/a-z/s/51

The Scytale was an ancient Greek form of encryption used for sending secret messages between generals. A narrow strip of leather was wound around a peculiarly shaped staff and the message written. The strip of leather was then detached and sent to the recipient, who upon winding it around a similarly shaped staff could read the message.
Found on
http://www.probertencyclopaedia.com/browse/FS.HTM
No exact match found.