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CRYPTOGRAPHY

CRYPTOGRAPHY. ŞEYMA GÜNEY. AGENDA. What is Cryptography Basic Definitions Cryptography (Old Times) Shift Substitution. Subject : Maths Target Students : 11th Grade Relevant Concept in Curriculum : Matrices

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CRYPTOGRAPHY

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  1. CRYPTOGRAPHY ŞEYMA GÜNEY

  2. AGENDA • What is Cryptography • BasicDefinitions • Cryptography (Old Times) • Shift • Substitution Subject: Maths TargetStudents: 11th Grade RelevantConcept in Curriculum: Matrices How toUse it: Inthebeginning of thesubtopic of encryptionwithmatricesexamples in ordertoattractattention.

  3. What is Cryptography?

  4. Basic Definitions Cryptology =cryptography + cryptanalysis.

  5. Cryptography (Old Times) • Two Main Techniques: • Shift • Substitution

  6. Shift Cipher: Plaintext:I CAME I SAW I CONQUERED Ciphertext: L FDPH L VDZ L FRQTXHUHG Sample: http://www.rot-n.com/

  7. Security Strength of a Shift Cipher Substitution: What’s the ciphertext of “solutionsoffinalexam”?

  8. Cryptography (Old Times) 1500 BC – Assyrian merchants’s intaglioas signature 1900 BC – Egyptian hieroglyphs

  9. ENİGMA: 1928-1945

  10. Crypto and Security Related Movies U-571" (2000) "Windtalkers" (2002) "A Beautiful Mind" (2001) ‘’PearlHarbor’’ (2001) ‘’TheDa Vinci Code’’ (2006) "Enigma" (2001)

  11. PDWJG UKQ Shift 22 letters THANK YOU 

  12. REFERENCES http://en.wikipedia.org/wiki/Cryptography (visited on February 25, 2012) http://www.sans.org/reading_room/whitepapers/vpns/history-encryption_730 (visited on February 25, 2012

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