as well as the SZ40 rotor stream cipher machine. The B-211 code was studied in detail, using traffic collected from two years before. A theoretical solution to the B211 code was developed by the group and back traffic was actually solved. However, the method did not work in practice when B211 traffic was again encountered. Buggisch did not mention any other solutions. In August 1942, Inspectorate 7/VI were again under reorganization. Buggisch was transferred to the newly formed machine specialist section. Buggisch conducted an investigation into Cypher Device 41 known as Schlüsselgerät 41. Buggisch stated that Device 41 was Fritz Menzer's idea, and the technical side was worked on by Wa Pruef 7/IV. Buggisch also worked on Call signs and weaknesses in the double Playfair cipher. In November 1942, Buggisch began research into the security of the naval version of Cypher Device 41. 1943 In the spring 1943, Buggisch conducted general investigations into the small technique TECHNIK Hagelin machine. The Swedish firm, A.B. Cryptograph, Stockholm produced an early type of Hagelin machine known as TEKNIK. One example of the BC 38 device was received from the Wa Pruef 7/IV unit, together with the statement that Boris Hagelin was working in America. The BC38 was a Swedish Hagelin machine. An engineer called Voss, who was a German spy in Sweden, had informed Germany that the US was planning to adopt a Hagelin idea. Buggisch and his team had investigated the Hagelin machine for security weaknesses. Buggisch also conducted research into Enigma machine 39 during this period. He also started work on a future German Standard Cypher teleprinter standard. French C36 messages appeared in the 5-figure Charles de Gaulle code traffic again, with the decoding of the work being done by means of the method developed earlier by Denffer. It was discovered to be transposed. Likewise more B-211 messages appeared but the theoretically worked out procedure did not result in a decode. During the summer of 1943, Buggisch works with Luzius and Rudolf Kochendörffer on the Crib problem with converter 209 (M-209), which had been captured from Italy. This was the first key recovery from a crib. Major Lechner was head of Section Inspectorate 7/VI. During this period Buggisch conducted conferences with OKW/Chi regarding security studies on the BC38 device, which was the Swedish Hagelin cipher machine, on the Enigma cipher machine and on the cypher teleprinter with Karl Stein and with