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Making, Breaking Codes
Tamara Veenstra
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Contents
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Front Matter
1
Invisible Ink Techniques
Invisible Ink Spy Letters.
Lemon Juice
Iron Sulfate and Tannic Acid
Phenolphthalein
Cobalt
Spy Museum Pen
Iodine Magic
What do you think?
Acknowledgements
2
Transposition Ciphers
Rail Fence Ciphers
Rectangular Ciphers
Keyword Rectangular Ciphers
Word Transposition Ciphers
Cardano Grill Ciphers
3
Substitution Ciphers
Shift Ciphers
Pigpen Ciphers
Polybius Cipher
Frequency Analysis
4
World War I Era Ciphers
ADFGX cipher
Zimmerman Telegram
5
The Beale Papers
6
The Enigma Machine
Cipher Machines
Enigma Mechanics
A One Rotor Version
The Paper Enigma
Permutations and Letter Chains
Cribs and Bombes
Authored in PreTeXt
Making, Breaking Codes
Tamara Veenstra
University of Redlands
tamara_veenstra@redlands.edu
