Cipher Machine Challenges

The Challenges

• M-209
  • The Problems,
  • The Bonus,
  • The Results
• C-35/C-36
• Kryha
• B-21
• TypeX
• Enigma
  • Enigma Model I
    (German Military),
  • Enigma model D
    (commercial)
• Hebern
  • Hebern 1 rotor
  • Hebern 5 rotors
• Japanese machines
  • RED
  • PURPLE
• T52
  • T52a/b
    
  • T52c, T52ca
    
  • T52d, T52e
    
• Lorenz cipher
  • SZ40
    
  • SZ42a
    
• Mysterious Method

Presentation

This page presents other Challenges (but I left links on my M-209 Challenge). At this time, there are few problems. I will add more in the coming months.

My favorite subjects are the encryption machines used before or during the Second World War. There are several types of problems. The simplest requires only knowing well the machine used. Some problems are simple fun puzzles (I hope!). Others problems require knowledge of the known decryption methods. Finally few problems have no obvious solutions. Finding their solution can advance the cryptographic science. You can suggest problems too. Perhaps I will add them to my challenges.

If you want to participate to my Challenges you send me your solution for each problem by email. Please, put the following text in the subject line: "The name of the Cipher Machine - Solution - Problem Number". For example "Kryha - Solution - 2nd problem".

The first time you send me any solution, give me your name (or nickname) and your country.