• Print graph paper
• A Vigenere applet

Cryptology Organizations and Companies

•  American Cryptogram Association
• NSA
• Visit the National Cryptologic Museum
• Aegean Park Press sells many books, including classic texts, on cryptography and related topics.
• Bletchley Park
  • Bletchley Park Trust
  • Codes and Ciphers in the Second World War
• Cryptologia
• RSA
• Simon Singh home page
• Alan Turing home page

Video Supplement

• Decoding Nazi Secrets

Language and Literature

• Poe
• The Gold Bug
• Text of The Adventure of the Dancing Men,  by A. Conan Doyle