This year I continued to research several cases of cryptologic history, I copied material from the US and UK national archives and I received reports from the NSA’s FOIA office. I also received some interesting files from friends of mine.
State Department’s strip cipher – reuse of alphabet strips and key lists (added info and made corrections)
1). Original information was presented in the following essays:
2). I posted a presentation of the book The Tanks of Operation Barbarossa and a Q&A with the author.
3). I uploaded the following files:
4). I updated the following essays:
The British Interdepartmental Cypher (added a pic of the ID codebook)
Rommel’s microwave link (added a link and info on patent US2211132A)
The Japanese FUJI diplomatic cipher 1941-43 (added info from TICOM DF-31B)
The Soviet K-37 ‘Crystal’ cipher machine (added info from TICOM DF-217)
The American M-209 cipher machine (added the paragraph ‘M-209 vs Enigma’)
Allen Dulles and the compromise of OSS codes in WWII (added information from the Higgs memorandum)
Compromise of State Department communications in WWII (added info and made corrections)
State Department’s strip cipher – reuse of alphabet strips and key lists (added info and made corrections)
5). I added links to several interesting sources:
Overall this was a productive year and many important files were located. There remain a handful of reports that I’m waiting for to be declassified. Hopefully that will happen in 2019.