"In Moscow, the warrant officer radio operator removed his headphones and nodded toward the teleprinter. "Faint but clear," he said. The printer began to chatter, sending out a screed of paper covered with a jumble of meaningless letters. When it fell silent, the officer beside the radio tore off the sheet and fed it through the decoder, already set to the formula of the agreed one-time pad. The decoder absorbed the sheet, its computer ran through the permutations, and it delivered the message in clear. The officer read the text and smiled. He telephoned a number, identified himself, checked the identity of the man he was addressing, and said: "Aurora is 'go.'""