What is definition inigma?

Enigma was a type of electro-mechanical encryption machine used by the German military during World War II to encrypt messages. It was invented by a German engineer named Arthur Scherbius in the 1920s and was considered almost unbreakable until a team of codebreakers at Bletchley Park in England, led by Alan Turing, managed to crack its code. The breaking of the Enigma code is often credited with helping to shorten the war by as much as two years.