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cipher, using the same key for both cages, the keys being derived from a novel. Marquarts section achieved a fair measure of success with this system, owing to errors in encipherment, stereotyped signatures and also the fact that the cages were often filled up to rectangles with rare letters. Under
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were random sequences of numbers contained in a book and organized by numbered rows and columns and were used as additives in reciphering. Marquart and his unit conducted extensive research in an attempt to discover the method by which they were produced. All the counts which they made, however,
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This code used two different keys, which were taken from a large group. Marquart was unable to guess at the size of the book that had never been captured. His work was looking for errors in encipherment which happened rarely and for messages in depth, which practically never occurred.
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such circumstances, it was often possible to recover the key from a single message. In some cases, by working out the basic text from which the keys had been derived, they were able to recognize and obtain the novel and hence to read all message traffic currently. All
140:) and was given command over Referat Ia for special research. Marquart's speciality at OKH had been research on the possibility of solution of hand ciphers, and after that with the hand cyphers of foreign countries which were passed to Section Ia from the various (
188:) by a periodic additive, the length of which varied from time to time. At first, the period was very short (5,7 or 9); later it rose to 35 or 45 and at the end, Marquart thought that it was used on a one-time basis, since no further successes could be achieved.
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121:) and for the first year carried out research on German hand ciphers. From 1940 to 1941, Marquart assisted Hans Pietsch, who was director of the mathematical cryptography department at In 7/VI, on hand ciphers, while working as a civilian.
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cipher consisted of the alphabet substituted into figures in such a way that the commonest letters were allotted one figure equivalents while the rarer letters were expressed as figure digraphs. The resulting figures were then reciphered
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failed to reveal any non-random characteristics in the design of the tables, and while they thought the
Blocknots must have been generated by machine, they were never able to draw any concrete deductions as a result of their research.
49:. He eventually became head of Referat Ia of Group IV of the organization in November 1944 engaged in research into German Army hand cryptographic systems. Prior to that period Marquart had been chief cryptanalysis in
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work on the double transposition systems was carried out entirely by hand by
Marquart, and no attempt was made to develop any statistical machine methods for solution.
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As head of special research section for hand ciphers, Marquart's work was of a varied nature. Marquart worked on the following hand ciphers:
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363:"I-205 - Detailed Interrogation Report of former Regierungsbaurat Johannes Anton Marquart of OKH/Gen d. NA"
312:"I-204 - Preliminary Interrogation Report on former Regierungsbaurat Johannes Marquart of OKH/Gen. d. NA"
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Preliminary
Interrogation Report on former Regierungsbaurat Johannes Marquart of OKH/Gen d NA.
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After the war, Marquart worked in the German insurance firm, Allianz
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Lastly, Marquart worked on a system used by the military forces of the
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Marquart conducted research in the Soviet Union
Blocknot traffic.
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This article incorporates text from this source, which is in the
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This article incorporates text from this source, which is in the
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German actuarial and insurance mathematician in the 19th century
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113:). In 1940 Marquart was posted to OKH/In 7/VI as an employee (
81:. From Frankfurt University in 1932, he received his degree (
277:"Interrogation of Major Dr. Rudolf Hentze Head of Group IV"
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464:Wehrmacht High Command Cipher Bureau
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65:in Erolzheim. He then attended the
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209:British Army Double Transposition
47:General der Nachrichtenaufklärung
41:, Marquart was employed into the
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61:Marquart was educated in the
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79:Goethe University Frankfurt
22:(born 27 September 1909 in
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148:) sections of Referat IV.
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900:Prince Christoph of Hesse
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429:organisations before 1945
87:diplomierter Mathematiker
26:in Germany) was a German
438:The Type of organisation
167:Cryptanalytic experience
192:Draža Mihailović System
99:Versicherungsmathematik
20:Johannes Anton Marquart
175:Josip Broz Tito System
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67:University of Tübingen
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924:GdNA Training Referat
369:. TICOM. 20 June 1947
1008:History of insurance
671:Rudolf Kochendörffer
441:Name of organisation
427:Signals intelligence
318:. TICOM. 22 May 1947
263:, 22. May 1947.
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198:Double Transposition
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371:. Retrieved
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666:Willi Rinow
548:Georg Hamel
161:French zone
91:mathematics
982:Categories
538:Ernst Witt
508:Karl Stein
373:14 October
322:14 October
287:8 February
243:References
1003:Actuaries
224:Blocknots
153:Stuttgart
37:. During
32:insurance
28:actuarial
24:Erolzheim
819:Pers Z S
737:B-Dienst
77:and the
425:German
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146:Laender
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444:People
142:German
134:German
115:German
107:German
95:German
83:German
51:KONA 5
179:This
89:) in
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57:Life
30:and
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