References
- Alexander, C. H. O'D. Cryptographic History of Work on German Naval ENIGMA. Catalogue Reference HW 25/1. The National Archives, UK. http://www.nationalarchives.gov.uk. This document has been reformatted by Graham Ellsbury; a link to it is available from Frode Weierud's CryptoCellar website: http://cryptocellar.org/Enigma/index.html (accessed 26 January 2015).
- Batey, M. 2008. “Dilly Knox—A Reminiscence of this Pioneer Enigma Cryptanalyst,” Cryptologia, 32(2): 104–130.
- Batey, M. 2009. Dilly—The Man Who Broke Enigmas. London: Biteback Publishing. Appendices 2 and 3 on “rodding” and “buttoning up” were contributed by Frank Carter.
- Deavours, Cipher A., and L. Kruh. 1985. Machine Cryptography and Modern Cryptanalysis. Norwood, MA: Artech House, Inc.
- Directions for Use of Keys on the Cipher Machine ENIGMA I. Catalogue Reference HW 25/9. The National Archives, UK. http://www.nationalarchives.gov.uk.
- Hinsley, F. H. and A. Stripp Eds. 1993. Codebreakers: The Inside Story of Bletchley Park. Oxford: Oxford University Press.
- Kozaczuk, W. 1984. Enigma-How the German Machine Cipher was Broken, and How it was Read by the Allies in World War Two, ed. and trans. C. Kasparek. see Appendix D. Frederick, MD: University Publications of America, Inc.
- Marks, P. 2015. “Enigma Wiring Data: Interpreting Allied Conventions from World War II,” Cryptologia, 39(1): 25–65.
- Marks, P., and F. Weierud. 2000. “Recovering the Wiring of Enigma's Umkehrwalze A,” Cryptologia, 24(1): 55–66.
- Rejewski, M. 1982. “Mathematical Solution of the Enigma Cipher,” Cryptologia, 6(1): 1–18.
- Turing, A. M. 1940. Mathematical Theory of ENIGMA Machine. Catalogue Reference HW 25/3. The National Archives, UK. http://www.nationalarchives.gov.uk This document has been carefully edited and reformatted as Turing's Treatise on Enigma by Ralph Erskine, Philip Marks, and Frode Weierud and is easily accessible at http://cryptocellar.org/Turing/index.html (accessed 8 December 2014).
- Weierud, F. 2008. Authentic German Army Test Message from 1930. http://cryptocellar.org/Enigma/EMsg1930.html (accessed 8 December 2014).