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2020
Eavesdropping on the Biafra-Lisbon link – breaking historical ciphers from the Biafran war, Cryptologia Online
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2020
German mathematicians and cryptology in WWII, Cryptologia, Vol. 44, No. 2
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2019
Enigma G: The counter Enigma, Cryptologia Online
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2017
Modern breaking of Enigma ciphertexts, Cryptologia, Vol. 41, No. 5
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2016
History and Modern Cryptanalysis of Enigma's Pluggable Reflector, Cryptologia, Vol. 40, No. 1
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2012
"Prof's Book: Seen in the Light of Cryptologic History" in Alan Turing – His Work and Impact, Elsevier
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2010
Spanish Enigma: A History of the Enigma in Spain, Cryptologia, Vol. 34, No. 4
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2006
"BP’s Sturgeon, The FISH That Laid No Eggs" in Colossus: The Secrets of Bletchley Park's Code-breaking Computers, Oxford University Press
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2005
Breaking German Army Ciphers, Cryptologia, Vol. 29, No. 3
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2005
Bletchley Park's Sturgeon, The FISH That Laid No Eggs, The Rutherford Journal, Vol. 1
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2004
"Bombe and Spider, Chapter 6 from Alan Turing’s ‘Treatise on Enigma’", in Essential Turing, Oxford University Press
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2003
PURPLE Revealed: Simulation and Computer-Aided Cryptanalysis of Angooki Taipu B, Cryptologia, Vol. 27, No. 1
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2002
Letter to the Editor: "Review of US Bombes", IEEE Annals of the History of Computing, Vol. 24, No. 3
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2000
Recovering the Wiring of Enigma's Umkehrwalze A, Cryptologia, Vol. 24, No. 1
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2000
"Sturgeon, The FISH BP Never Really Caught" in the Proceedings on Coding Theory and Cryptography, Springer Verlag
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2000
"The Geheimschreiber Secret" in the Proceedings on Coding Theory and Cryptography, Springer Verlag
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1999
TIRPITZ and the Japanese-German Naval War Communication Agreement, NCVA Cryptolog, Vol. 20, No. 3
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1999
The Swiss NEMA Cipher Machine, Cryptologia, Vol. 23, No. 4
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1998
Sweden, Cryptographic Superpower – A Book Review, Cryptologia, Vol. 22, No. 1
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1998
Enigma Variations: An Extended Family of Machines, Cryptologia, Vol. 22, No. 3
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1994
Codebreakers: The Inside Story of Bletchley Park – A Book Review, IEEE Annals of the History of Computing, Vol. 16, No. 1
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1987
Naval Enigma: M4 and Its Rotors, Cryptologia, Vol. 11, No. 4
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1986
Machine Secrets: A Book Review, Cryptologia, Vol.10, No.1