Early Crypto Historical Events A snap shot over time.

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Presentation transcript:

Early Crypto Historical Events A snap shot over time

Agenda Short Intro on Crypto Start Video (2 hours) Lunch is provided End Video Discussion

Demaratus King of Sparta GO WEST Steganography (Hidden writing) Greece vs Persia 480 BC GO WEST Others: silk and wax, eggs and alum, etc.

Spartan Scytale (wood staff) 404 BC TRANSPOSITION CIPHER SEND THE MATERIAL NOW S E N D T H E M A T E R I A L N O W SEIEMANALDTNTEOHRW.

Substitution Cipher Karma-Sutra 4 AD “The art of understanding writing in cypher, and the writing of words in a peculiar way.” Alphabet: ABCDEFGHIJKLMNOPQRSTUVWXYZ Substitution: DEFGHIJKLMNOPQRSTUVWXYZABC “ROME SWEET ROME” “URPH VZHHW URPH” CAESAR CIPHER (FIRST MILITARY USE OF SUBSTITUTION CIPHER)

The Vigenère Cipher codeword: MONTREALMONTREALMO plaintext: SENDTHEMATERIALNOW ciphertext: ESAWKLEXMHRKZELYAK M S 1523 to 1596.

Baddington Plot A life hung on a cipher Queen Elizabeth I Protestant Mary Queen of Scots Catholic

Walsingham Mary Queen of Scots Conspirators Code Breaker Thomas Phillipes Cipher Clear Text Evidence

Warning Do not rely on weak crypto February 8th, Executed

Enigma (1917) Museum Trip Automatically combines substitution and transposition

Crypto System a pair of data transformations: –one encrypts –the other decrypts Encrypt plain text Decrypt cipher text plain text key

Symmetric Key Crypto System same key is used for both transformations Encrypt plain text Decrypt ciphertext plain text Key=1 IBM HAL

Symmetric Algorithms Rijndael - AES RC6 Twofish Casear RC4 CAST DES Triple DES Rijndael

Video Please turn off cell-phones Dispose of all material