What is Ultra?

The term 'Ultra' is most commonly associated with the Allied codebreaking efforts during World War II. It refers to the intelligence obtained by breaking high-level encrypted enemy communications, primarily those created by the German Enigma and Lorenz ciphers. 'Ultra' provided valuable information about enemy plans, movements, and strategies, significantly impacting the course of the war. While the term itself doesn't represent a specific technology, it represents the output of a sophisticated combination of cryptography, cryptanalysis, signals intelligence, and codebreaking machines (like the Bombe) used to decipher enemy communications.