Gisbert Hasenjaeger. During the summer Buggisch worked on and broke the Croatian Enigma. From about August 1943, Buggisch worked on a captured specimen of converter 209 from Italy. During the course of 1943, the Inspectorate 7/VI was renamed to the Signal Intelligence Section of the Department of signals of the General Army Office (). In October 1943, the office moved to Jüterbog. In the winter of 1943, Buggisch worked with Doering, whose specialty was also machine ciphers, on Russian cypher teleprinters, i.e. the Russian Fish device, cribs and supposed results of the device from the Forschungsamt. He also worked on the Enigma specifically crib problems, Bigram systems. On the Converted 209, he worked on column separation (). He also conducted continued research on the C36 messages, looking at messages with complicated enciphering techniques, which were solved in the spring. Later, he conducted lectures on theory, specifically discussing depth problems, X2 and W2 methods. Towards the end of the year, in November 1943, Buggisch had a discussion with Korvettenkapitän Jaeckle. He has become acquainted with Jaeckle in 1943, when Jaeckle who was an ordinary Naval Signals Officer, had managed to get hold of a model of the M-209 cipher device and had worked out a solution while sitting idle in a French port. The solution was, in fact, childish and consisted of nothing more than a study of the theoretical working equation of the machine. Jaeckle had talked his way into the SKL and had talked a lot about getting a section of 200 men to work on the machine. Actually he had been exposed quickly and had been sent back to sea after three or four months. Buggisch considered this a very foolish incident altogether. 1944 In the first two months of 1944, Buggisch conducted discussions with colleagues on cypher problems and the teleprinter T43, which was the new secure model first discussed in spring 1943 while he was staying in Köthen During the first half of 1944, he conducted research into the weaknesses of the Naval Emergency Key along with Kapitän zur See, Captain at sea Beegemann and Fregattenkapitän Frigate captain Singer. He studied the Army Enigma, looking for weaknesses in that system. He examined the machine, and specifically looked for compromise of the key through message settings and looked at the question of the possibility in principle of breaking cyphers by means of statistical analysis on enormous amounts