Recovering the Wiring of Enigma's Umkehrwalze A. - Philip Marks; Frode Weierud (Cryptologia, 2000)

Umkehrwalze D: Enigma's Rewirable Reflector - Part I. - Philip Marks (Cryptologia, 2001)

Umkehrwalze D: Enigma's Rewirable Reflector - Part II. - Philip C. Marks (Cryptologia, 2001)

Umkehrwalze D: Enigma's Rewirable Reflector - Part III. - Philip C. Marks (Cryptologia, 2001)

Naval Enigma: Seahorse and Other Kriegsmarine Cipher Blunders. - Ralph Erskine; Philip Marks (Cryptologia, 2004)

Operational Use and Cryptanalysis of the Kryha Cipher Machine. - Philip Marks (Cryptologia, 2011)

Enigma Wiring Data: Interpreting Allied Conventions from World War II. - Philip Marks (Cryptologia, 2015)

Mr. Twinn's bombes. - Philip Marks (Cryptologia, 2018)

Review of Behind the Enigma by John FerrisFerris, John. Behind the Enigma. The Authorized History of GCHQ, Britain's Secret Cyber-Intelligence Agency . Bloomsbury Publishing, New York, NY, 2020. 823 pages, Hardcover, $36. ISBN 978-1-63557-465-4. - Philip Marks (Cryptologia, 2024)