Contents.

• Main page.
• Toby's links.
• E-mail Toby.

• FRA (Försvarets Radioanstalt [National Defence Radio Establishment]).

• Simple substitution & Viking cryptography.
• Polyalphabetic substitution.
• Transposition ciphers.
• Codes.

• Cryptanalysis.

• Swedish Navy cipher of 1915.
• 1930ies Swedish diplomatic code.

• General info.
• The world's first cryptomachine.
• de Champs' Cipher Machine.
• Hagelin B-211.
• Hagelin C-35.
• Hagelin C-38 / M-209.
• Hagelin C-52.
• Hagelin CX-52.
• Transvertex HC-9.
• Teletype cryptomachines.
• Machines made by Transvertex

• Crypto Quiz Page.
• Zurbian military cryptograms.
• Pzilatian diplomatic intercepts.
• Zurbian mystery intercepts.
• A Superenciphered Code Exercise.
• A Real Cryptogram.
• Prelude to War - Hagelin C-38 Quiz.