MD’s Reviews > The Secret in Building 26: The Untold Story of How America Broke the Final U-boat Enigma Code > Status Update

Germans used a teleprinter based code for their most secret communications. Instead of encrypting letters it encrypted the lower-level stream of bits that represented them. It was the need to design machines to decipher this binary-based approach that led to the development of Colossus, sometimes viewed as the first modern computer.