The <a href="https://en.wikipedia.org/wiki/Enigma_machine" class="extiw" title="en:Enigma machine">Enigma machine</a> is a cipher device developed and used in the early- to mid-20th century to protect commercial, diplomatic, and military communication. It was employed extensively by <a href="https://en.wikipedia.org/wiki/Nazi_Germany" class="extiw" title="en:Nazi Germany">Nazi Germany</a> during <a href="https://en.wikipedia.org/wiki/World_War_II" class="extiw" title="en:World War II">World War II</a>, in all branches of the German military. Enigma has an electromechanical rotor mechanism that scrambles the 26 letters of the alphabet. Germany introduced a series of improvements to Enigma over the years.<br><ul><li>World War II 3-rotor Enigma machines</li>
<li>Destroyed Enigma</li>
<li>Enigma 4-rotor with remote</li>
<li>Enigma code machine with printer attachment</li>
<li>German World War II anti-rumour, anti-espionage campaign posters on secrecy and careless talk:
<ul><li><i>Schweig!</i> (<i>Plakat 44 der Reichspropagandaleitung H. A. Pro von 1943 Größe ca 840 mm x 580 mm</i>)</li>
<li><i>Pst! Feind hört mit!</i> (<i>Nationalsozialistisches Propagandaplakat aus der Anti-Spionage-Kampagne "Feind hört mit"</i>), "Shush! The Enemy is listening!", warning of espionage</li>
<li><i><a rel="nofollow" class="external text" href="https://www.dhm.de/lemo/bestand/objekt/nationalsozialistische-anti-spionage-propaganda-1939.html">Achtung Spione, Vorsicht bei Gesprächen!</a></i> by <a href="https://en.wikipedia.org/wiki/Theo_Matejko" class="extiw" title="en:Theo Matejko">Theo Matejko</a> c. 1939 (<i>Nationalsozialistische Anti-Spionage-Propaganda, 1939</i>)</li></ul></li></ul><dl><dd>etc.</dd></dl>
Photo taken in 2015 showing items from the exhibitions in the former <a href="https://en.wikipedia.org/wiki/The_International_Museum_of_World_War_II" class="extiw" title="en:The International Museum of World War II">International Museum of World War II</a> in Natick, Massachusetts, a few miles west of Boston. The museum existed from 1999 to 2019 and housed a by-reservation-only collection of memorabilia and militaria consisting of over 7,000 artifacts, 100 uniforms, books, photos, etc.
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