Mariner 9, the first spacecraft to successfully go into orbit around Mars launched on May 30, 1971, and arrived November 13, 1971 for a duration of 167 days. This is the same pattern that has held up for more almost 50 years of Mars exploration: approximately 150-300 days.
Enigma was invented by the German engineer Arthur Scherbius at the end of World War I. Early models were used commercially from the early 1920s, and adopted by military and government services of several countries, most notably Nazi Germany before and during World War II.
The most common version of the Enigma machine that was broken by the codebreakers at Bletchley Park (BP) was the Enigma-I, the machine that was used by the German Army and Air Force. The Naval machines, the M3 and M4, were also broken on a regular basis.