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A cipher that was secure for 300 years

Published byDwight Nicholson Modified over 6 years ago

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Presentation on theme: "A cipher that was secure for 300 years"— Presentation transcript:

1 A cipher that was secure for 300 years

2 Cryptology: Making and breaking codes and ciphers
Zimmerman Telegram 1917 Ciphers Polybius Second Century BC

3 Cryptology Cryptography Cryptanalysis

4 Mathematicians as cryptologists

5 No Such Agency (1952 shhh!)

6 National Security Agency

7 Le Chiffe Indechiffrable
Blaise de Vigenere 1523 – 1596. Johannes Trithemius 1462 – In 1508. Giovan Battista Bellaso ???? . In 1553. Charles Dodgson 1832 – In 1868.

8 Caesar Cipher Julius Caesar 100 – 44 BC

9 Vigenere square

10 Confederate Cipher Wheel
Manchester Bluff Complete Victory Come Retribution

11 The cryptanalysts Friedrich Wilhelm Kasiski 1805 – In Charles Babbage 1791 – In ????. William Friedman 1891 – 1969.

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