"chemra" - 1 õppematerjal

TheCodeBreakers

But Painvin was getting his feet on the ground, and the subsequent key recoveries came with increasing speed: nine and a half days, two days, and, finally, one day. But by then the French had been dealt two unpleasant blows—one military, one cryptographic. Ludendorff had again managed to conceal the time and place of a major assault. Fifteen of his divisions fell by surprise on seven. A gray flood of Germans inundated the French positions in the heights of the Chemra-des-Dames and surged forward irresistibly until it lapped the banks of the Marne only 30 miles from Paris, almost submerging the Allied cause. At the same time, Painvin suddenly saw, on June 1, the ADFGX messages complicated by the addition of a sixth letter, v. Probably the Germans expanded their checkerboard to 6 X 6. But why? For homophones to further blunt the frequency clues? Or to insert the ten digits? Painvin did not know. "In short," he said, "I had a moment of discouragement