The Imitation Game and

Cryptography

Anry Lu (2015-03-18)

雷

Alan Turing

Alan Turing

● 1912 - born

● 1940 - 1st bombe

● 1952 - chemical castration due to

homosexual

● 1954 - death because of cyanide poisoning

● 2009 - apology from Prime Minister

● 2013 - pardon from Queen Elizabeth II

Enigma Machine

Enigma Simulator

http://enigmaco.de/enigma/enigma.html

Initial Setup (crypt key)

● Choice of rotors

● Initial position of rotors

● Plugboard connections

● Indicator

● 3-rotor with 10-pair plugboard wireo rotor choice: 5*4*3

o initial position: 26*26*26

o plugboard: 26!/(6!*10!*210)

o total: 159*(1018)

How to Crack

● A letter would never become itself

● Finding Crib:o WETTERBERICHT

o HEIL HITLER

Bomde

Modern Secure Communication - TLS

Reference

● http://en.wikipedia.org/wiki/Alan_Turing

● http://en.wikipedia.org/wiki/Enigma_mach

ine

● http://en.wikipedia.org/wiki/Bombe

● http://tehgeektive.com/2013/01/18/the-

enigma-machine-had-

158962555217826360000-configurations-

but-it-had-a-flaw/