The Enigma-M4 (also called Schlüssel M, more precisely Schlüssel M Form M4) is a rotor key machine that was used for encrypted communication by the German...

Cryptanalysis of the Enigma ciphering system enabled the western Allies in World War II to read substantial amounts of Morse-coded radio communications...

the Naval M4 model, an Enigma implemented in electronics (Enigma-E), various simulators and paper-and-scissors analogues. A rare Abwehr Enigma machine,...

Look up m4 in Wiktionary, the free dictionary. M4 or M-4 most often refers to: M4 carbine, an American carbine M4 Sherman, an American World War II medium...

List of Enigma machine simulators lists software implementations of the Enigma machine, a rotor cypher device that was invented by German engineer Arthur...

and army Enigmas could be set up in 1.5×1019 ways. In 1941 the German navy introduced a version of Enigma with a rotatable reflector (the M4 or Four-rotor...

This article contains technical details about the rotors of the Enigma machine. Understanding the way the machine encrypts requires taking into account...

for the Enigma Model M3, and from 1 February 1942 exclusively for the Enigma M4. It must not be confused with the Kenngruppenheft which was used with...

the Naval Enigma M4 rotatable Umkehrwalze (reversing roller or reflector) in the neutral position, making it equivalent to a standard Enigma and thus making...

Hugh Sebag-Montefiore called him "the greatest expert on the Enigma-M4", which was the Enigma cipher system used by the German Navy from February 1942 to...