Articles on this Page
- 05/12/18--23:55: _TICOM report D-83 ‘...
- 05/13/18--23:33: _Another correction
- 05/25/18--07:09: _TICOM DF-196
- 05/30/18--23:11: _TICOM report DF-217
- 06/01/18--09:19: _Update
- 06/04/18--08:01: _Soviet cryptographe...
- 06/08/18--11:37: _The Tanks of Operat...
- 06/11/18--22:55: _Update
- 06/20/18--10:06: _Proceedings of the ...
- 07/05/18--08:06: _The Higgs memorandu...
- 07/06/18--06:39: _Update
- 07/17/18--05:31: _‘Experiences 1920-1...
- 07/29/18--03:26: _TICOM DF-174A
- 08/10/18--09:25: _Interesting report ...
- 08/14/18--23:37: _Cryptology files on...
- 08/18/18--06:12: _Update
- 09/08/18--22:57: _Remaining research ...
- 09/10/18--06:35: _German solution of ...
- 09/19/18--06:10: _U.S. Strategic Bomb...
- 09/29/18--02:29: _Greek civil war dec...
Military and intelligence history mostly dealing with World War II.
- 05/13/18--23:33: Another correction
- 05/25/18--07:09: TICOM DF-196
- 05/30/18--23:11: TICOM report DF-217
- 06/01/18--09:19: Update
- 06/04/18--08:01: Soviet cryptographer I.Ya.Verchenko
- 06/08/18--11:37: The Tanks of Operation Barbarossa
- 06/11/18--22:55: Update
- 07/06/18--06:39: Update
- 07/17/18--05:31: ‘Experiences 1920-1939’
- 07/29/18--03:26: TICOM DF-174A
- 08/10/18--09:25: Interesting report on Luftwaffe operations 1941-43
- 08/14/18--23:37: Cryptology files on Elizebeth Friedman and Coast Guard Unit 387
- 08/18/18--06:12: Update
- 09/08/18--22:57: Remaining research projects
- 09/10/18--06:35: German solution of State Department A-1 Code in 1944
- 09/29/18--02:29: Greek civil war decrypts
‘In the period 1940-41 the cipher research department of the German Army’s signal intelligence agency Inspectorate 7/VI had several talented mathematicians (Pietsch, Steinberg, Marquart, Schulz, Rinow) tasked with examining difficult foreign cryptosystems. The war diary of Inspectorate 7/VI shows that these individuals investigated the Typex device and by May ’41 had ascertained that it was an Enigma type device with 5 multistep rotors, the last two of which did not move during encipherment. Their research was confirmed in May, when they visited the facilities of the Signal Intelligence Agency of the Supreme Command of the Armed Forces - OKW/Chi and were able to examine a Typex machine captured at Dunkirk. The device worked according to the Enigma principle with the two rotors on the left remaining stationary and the wiring of the entry and reflector wheels could be recovered’.
The NSA FOIA/MDR office has declassified the TICOM report DF-196 ‘Report on Russian decryption in the former German Army’.
I’ve uploaded TICOM report DF-217 ‘Russian cipher device K-37’, written by dr Grimmsen.
Solution of this indicator led to the decipherment of more messages and dr Kunze (head of the ‘Mathematical Cryptanalytic Subsection’ of Pers Z) was able to use the information recovered in order to solve more message indicators. The inroads made by the solution of indicator groups led to the eventual recovery of the underlying code by the linguistic group and the current exploitation of this traffic.
When the Germans invaded the Soviet Union in 1941 the Red Army had four times as many tanks as the Wehrmacht and their tanks were seemingly superior, yet the Wehrmacht won the border battles with extraordinary ease the Red Armys tank force was pushed aside and for the most part annihilated. How was this victory achieved, and were the Soviet tanks really as well designed as is often believed? These are the basic questions Boris Kavalerchik answers in this absorbing study of the tanks and the tank tactics of the two armies that confronted each other at the start of the war on the Eastern Front. Drawing on technical and operational documents from Russian archives, many of which were classified until recently and are unknown to Western readers, he compares the strengths and weakness of the tanks and the different ways in which they were used by the opposing armies. His work will be essential reading for military historians who are interested in the development of armoured warfare and in this aspect of the struggle on the Eastern Front.
I’ve added a Q&A section in The Tanks of Operation Barbarossa.
During WWII the US State Department used several cryptosystems in order to protect its radio communications from the Axis powers. For low level messages the unenciphered Gray and Brown codebooks were used. For important messages four different codebooks (A1, B1, C1, D1) enciphered with substitution tables were available.
Site governmentattic.com has uploaded the NSA report ‘Experiences 1920-1939’ by Brigadier John H. Tiltman.
The report has information on the Enigma cipher machine, the SG 39 cipher machine and the Enigma modification Lückenfüllerwalze.
‘How were German air force resources distributed between different fronts in the years 1941 to 1943 and what are the implications of this case study for understanding the political economy of the period?’ by Dan Zamansky.
Uploaded to archive.org by mr Jason Fagone.
I’ve added information in Compromise of State Department communications in WWII.
What files am I still trying to locate? Let’s see.
During WWII the US State Department used several codebooks for enciphering radio telegrams. These were the low level Gray and Brown codes and the high level A1, B1 and C1 codes.
In the site primarysources.brillonline.com there are several decrypted Greek Communist military radio messages dated 1948.