The Turing Guide
142 | 13 INTRODUCING BANBURISmUS eyes counting where the holes in Banburies coincided, may have been less affectionate. Their co ...
CHAPTER 14 Tunny: Hitler’s biggest fish jack copeland A fter 1942, the Tunny cipher machine took over increasingly from Enigma f ...
144 | 14 TUNNy: HITlER’S BIGGEST fISH figure 14.1 The Tunny machine in its case (top) and with its twelve encoding wheels expose ...
COPElAND | 145 to eavesdrop on lengthy back-and-forth communications between the grand architects of Germany’s battle plans. Tun ...
146 | 14 TUNNy: HITlER’S BIGGEST fISH Teleprinter code produces a rhythmic, warbling sound when transmitted at high speed by rad ...
COPElAND | 147 link a fishy name: Berlin–Paris was ‘Jellyfish’, Berlin–Rome was ‘Bream’, Berlin–Copenhagen was ‘Turbot’, and so ...
148 | 14 TUNNy: HITlER’S BIGGEST fISH The Tunny machine’s internal mechanisms produced a stream of letters that Bletchley Park c ...
COPElAND | 149 The twelve wheels The Tunny machine produced the key-stream by adding together two other letter streams, called b ...
150 | 14 TUNNy: HITlER’S BIGGEST fISH the wheel rotated. The operator could adjust the cams, sliding any that he selected sidewa ...
COPElAND | 151 tackling Tunny. He had very little to go on. Tunny was believed to encipher teleprinter mes- sages. It also seeme ...
152 | 14 TUNNy: HITlER’S BIGGEST fISH Nevertheless, in January 1942, a young member of Bletchley Park’s Research Section, Willia ...
COPElAND | 153 ABCD the codebreaker used the rules of Tunny addition to add A to B, B to C, and C to D. One might think that add ...
154 | 14 TUNNy: HITlER’S BIGGEST fISH figure 14.7 Robinson, precursor to Colossus. This machine, eventually called ‘Old Robinson ...
COPElAND | 155 A Colossal computer Telephone engineer Tommy Flowers (Fig. 6.1) knew that he could build something better than He ...
156 | 14 TUNNy: HITlER’S BIGGEST fISH Colossus used Tutte’s method to cleanse the ciphertext of the part of the key that the chi ...
COPElAND | 157 Newman’s incredible factory of giant computers did not outlast the war, however. With Germany’s capitulation, in ...
158 | 14 TUNNy: HITlER’S BIGGEST fISH At the time the Colossi were dismantled, news was leaking out about another electronic com ...
COPElAND | 159 scope. Nor did Colossus incorporate Turing’s all-important stored-program concept. The com- puter was programmed ...
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CHAPTER 15 We were the world’s first computer operators eleanor ireland I n 1944 I worked at Bletchley Park and lived at nearby ...
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