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CRYPTOGRAPHY ŞEYMA GÜNEY

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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 - PowerPoint PPT Presentation

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Page 1: CRYPTOGRAPHY

CRYPTOGRAPHY

ŞEYMA GÜNEY

Page 2: CRYPTOGRAPHY

AGENDA1. What is Cryptography2. Basic Definitions 3. Cryptography (Old Times)

Shift Substitution

Subject: MathsTarget Students: 11th GradeRelevant Concept in Curriculum: MatricesHow to Use it: In the beginning of the subtopic of encryption with matrices examples in order to attract attention.

Page 3: CRYPTOGRAPHY

What is Cryptography?

Page 4: CRYPTOGRAPHY

Basic Definitions

Cryptology = cryptography + cryptanalysis.

Page 5: CRYPTOGRAPHY

Cryptography (Old Times)

Two Main Techniques:

• Shift • Substitution

Page 6: CRYPTOGRAPHY

Shift Cipher:

Plaintext : I CAME I SAW I CONQUEREDCiphertext: L FDPH L VDZ L FRQTXHUHG

http://www.rot-n.com/Sample:

http://www.rot-n.com/
http://www.rot-n.com/
Page 7: CRYPTOGRAPHY

Security Strength of a Shift CipherSubstitution:

What’s the ciphertext of “solutionsoffinalexam”?

Page 8: CRYPTOGRAPHY

1500 BC – Assyrian merchants’s

intaglio as signature

1900 BC – Egyptianhieroglyphs

Cryptography (Old Times)

Page 9: CRYPTOGRAPHY
Page 10: CRYPTOGRAPHY

ENİGMA: 1928-1945

Page 11: CRYPTOGRAPHY

Crypto and Security Related Movies"Windtalkers" (2002)

"Enigma" (2001)

U-571" (2000)

‘’Pearl Harbor’’ (2001)‘’The Da Vinci Code’’ (2006)

"A Beautiful Mind" (2001)

http://www.imdb.com/title/tt0245562/photogallery
http://www.imdb.com/title/tt0141926/photogallery
Page 12: CRYPTOGRAPHY

PDWJG UKQ

THANK YOU

Shift 22 letters

Page 13: CRYPTOGRAPHY

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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