The M-94 was a piece of cryptographic equipment used by the United States Army, consisting of several lettered discs arranged as a cylinder. It was also employed by the US Navy, under the name CSP 488.

The M-94 was widely used from 1922 to 1943 by the U.S. Army as tactical, cryptographic encoding/decoding device. Using the same principle as Thomas Jefferson’s cipher device, disks are rotated to encipher a message. During World War II, the M-94 was replaced by the more complex M-209 (1943).

M-94 was a polyalphabetic manual substitution cipher device for tactical messages, developed around 1917 1 by US Army major Joseph O. Mauborgne, and manufactured by several companies, including Doehler, Reeve and Alcoa.

The M-94 was a piece of cryptographic equipment used by the United States army, consisting of several lettered discs arranged as a cylinder. The idea for the device was conceived by Colonel Parker Hitt and then developed by Major Joseph Mauborgne in 1917.

So, did Mauborgne use the prototype M-94s during WW1 by the Army attachés, or others before Army approval? Did the Germans Break Strip Ciphers in WW2?

My friend Bryan Locks made a working replica of the Army M-94 in 1989. It uses 25 Bakelite disks with the alphabets taped around the outer edge. A central rod clamps the disks. Each disk has a label in a pocket on the flat face. The Navy referred to this unit as the CSP-488.

The M-94 was a W.W.II United States Army Signal Corps cipher device used from the early 1920's up till 1942 as a low level, tactical, cryptographic encoding/decoding device. A version used by the U.S. Navy was called CSP-488.

The M-94 was a cipher device based off the polyalphabetic manual substitution cipher. It was created by US Army major Joseph Mauborgne in 1917 with inspiration from a similar device invented by Thomas Jefferson in 1795. In 1921, it was introduced to the Army.

First, we give a short introduction of the history of disc ciphers. After that, we explain how the M-94 cipher device is used. After that, we discuss the keyspace size of the M-94. Finally, we...

Nov 3, 2021 · The M-94, based on a system invented by Thomas Jefferson, then improved by French military cryptanalyst Etienne Bazeries (Bazeries Cylinder) was developed by Major Joseph Mauborgne in 1917. It was in use until 1942 when more complex machines like the Hagelin-designed 6-wheel M-209 replaced it. This auction is now finished.