This software is an accurate simulation of the M-209 Cipher Machine, used by the US Military during World War 2. The M-209, the American licensed version of the Hagelin C-38, was a portable hand operated cipher machine for tactical messages. It had the size of a lunchbox and presented a brilliant mechanical design, developed by the Swedish cryptographer Boris Hagelin.

This simulator, fully compatible with the original cipher machine, enables realistic operation with rotating wheels, setting of wheel pins and drum lugs, combined with authentic graphics. The program comes with a very complete helpfile, containing the manual, the enciphering procedures from the US military and all technical details on the machine.