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- SATURDAY EVENING POST ARTICLE ENTITLED 'ARE WE STIFLING THE INVENTORS?' https://www.nsa.gov/news-features/declassified-documents/friedman-documents/assets/files/publications/FOLDER_500/41784819082384.pdf Date: March 28, 2018
- AMERICAN ARMY FIELD CODES IN THE AMERICAN EXPEDITIONARY FORCES DURING THE FIRST WORLD WAR https://www.nsa.gov/news-features/declassified-documents/friedman-documents/assets/files/publications/FOLDER_267/41784809082383.pdf Date: March 28, 2018
- GERMAN MILITARY CIPHERS FROM FEBRUARY TO NOVEMBER 1918 https://www.nsa.gov/news-features/declassified-documents/friedman-documents/assets/files/publications/FOLDER_268/41784789082381.pdf Date: March 28, 2018
- GENERAL SOLUTION FOR THE ADFGVX CIPHER SYSTEM https://www.nsa.gov/news-features/declassified-documents/friedman-documents/assets/files/publications/FOLDER_269/41784769082379.pdf Date: March 28, 2018
- STUDIES IN GERMAN DIPLOMATIC CODES EMPLOYED DURING THE (FIRST) WORLD WAR https://www.nsa.gov/news-features/declassified-documents/friedman-documents/assets/files/publications/FOLDER_270/41784749082377.pdf Date: March 28, 2018
- MILITARY CRYPTANALYSIS, PART III: APERIODIC SUBSTITUTION SYSTEMS https://www.nsa.gov/news-features/declassified-documents/friedman-documents/assets/files/publications/FOLDER_511/41784459082351.pdf Date: March 28, 2018
- ARMY EXTENSION COURSES: SUB COURSE -- MILITARY CRYPTANALYSIS PART II: SIMPLER VARIETIES OF POLYALPHABETIC SUBSTITUTION SYSTEMS https://www.nsa.gov/news-features/declassified-documents/friedman-documents/assets/files/publications/FOLDER_509/41784369082342.pdf Date: March 28, 2018
- MILITARY CRYPTANALYSIS, PART II, SIMPLER VARIETIES OF POLYALPHABETIC SUBSTITUTION SYSTEMS https://www.nsa.gov/news-features/declassified-documents/friedman-documents/assets/files/publications/FOLDER_508/41784299082338.pdf Date: March 28, 2018
- THE PRODUCTION AND DETECTION OF MESSAGES IN CONCEALED WRITING AND IMAGES https://www.nsa.gov/news-features/declassified-documents/friedman-documents/assets/files/publications/FOLDER_507/41783979082304.pdf Date: March 28, 2018
- METHODS FOR THE RECONSTRUCTION OF PRIMARY ALPHABETS https://www.nsa.gov/news-features/declassified-documents/friedman-documents/assets/files/publications/FOLDER_507/41783829082288.pdf Date: March 28, 2018
