It was one of the first crypto machines to encrypt data such as facsimile.
2.
It was the most widely used crypto machine in the US armed forces until the mid-1960s and was the first machine capable of supporting large networks that was considered secure against known plaintext attack.
3.
It was the first crypto machine, developed under one centralized cryptologic organisation as a standard machine for all parts of the armed forces, and it was the first cipher machine to use electronics ( vacuum tubes ).
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