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Click here to go directly to the SIGABA simulation.
Used in the closing days of the war, SIGABA was the only machine used by any participant of the war to remain totally unbroken for the duration of its use. The United States was fortunate enough to be the entity that possessed it.
The SIGABA was a rotor machine, much like the Enigma (The Navy called it ECM-Mark Two). However, it was better. The improvements:
After World War II, the SIGABA remained in service until 1959, when it was retired for being too slow. The machines were systematically destroyed, and only a few still exist. The largest reserve belongs to the National Security Agency (NSA), which claims to own six.
It should be noted that this complicated system is extremely insecure in today's world. It only takes a matter of seconds for a modern supercomputer to break the SIGABA. (It would take the average desktop a very long time.)