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Week 11 Secret Codes of the Middle Ages

Week 11 Secret Codes of the Middle Ages. Compiled by Amy. Ancient Code. Steganography. Hides the existence of the message. This can use “invisible ink”. Cryptography - Transposition. Makes the Messge hard to read. Use transposition by rearranging the letters. Cryptography - Substitution.

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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

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