Links for lecture 20

Text Analyzer

Anotherletter frequency histogram tool

Simon Singh's Letter Frequency Analysis Tool

Textalyzer

Foreign Language Frequency Analysis

The State of the Union in Words: A Look at the 34,000 State of the Union Words Delivered of George W. Bush - New York Times

Read more about the Enigma Machine
Play with the Enigma!
Enigma Simulator

The code book and its cd-rom have a nice chapter on the subject. BTW, our friend Turing was instrumental in cracking this code. The movie U-571 deals with the military operation that allowed the code to be cracked, though it is not very historically accurate. There is a very good BBC movie about Turing and breaking the Enigma code.