Week 11 Secret Codes of the Middle Ages - PowerPoint PPT Presentation

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Week 11 Secret Codes of the Middle Ages

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  1. Week 11Secret Codes of the Middle Ages Compiled by Amy

  2. Ancient Code

  3. Steganography • Hides the existence of the message. • This can use “invisible ink”

  4. Cryptography - Transposition • Makes the Messge hard to read. • Use transposition by rearranging the letters.

  5. Cryptography - Substitution • Code • Substitutes a word or idea • Cipher • Substitutes by letter • Monoalphabetic uses one letter to equal one symbol • Polyalphabetic uses several possible symbols to represent one letter • Homophonic – some letters have several choices • Cipher Polybius Square

  6. Leon Battiste

  7. Polyalphabetic Substitution http://crypto.interactive-maths.com/polyalphabetic-substitution-ciphers.html

  8. Cryptex • Made up by Dan Brown in the Davinci Code! • It is like a bicycle lock and if you get it wrong… • It will release acid that will destroy the message.

  9. Some Unbreakable Codes http://www.newscientist.com/special/unbreakable-codes

  10. Making Your Own Cypher! http://hldennis.com/secrets-to-break/secrets-to-break-book-three/

  11. Cool Websites • http://www.stringpage.com/other/crypto.html • http://www.ciphermysteries.com/2008/06/01/codes-and-ciphers-through-the-middle-ages • http://www.kidsmakestuff.com/articles/show/18hm