| The history of information security: a comprehensive handbook KMM de Leeuw, J Bergstra Elsevier, 2007 | 150 | 2007 |
| Bitcoin and beyond: exclusively informational monies JA Bergstra, K de Leeuw arXiv preprint arXiv:1304.4758, 2013 | 46 | 2013 |
| The Black Chamber in the Dutch Republic during the War of the Spanish Succession and its aftermath, 1707–1715 K De Leeuw The Historical Journal 42 (1), 133-156, 1999 | 25 | 1999 |
| Questions related to Bitcoin and other Informational Money JA Bergstra, K de Leeuw arXiv preprint arXiv:1305.5956, 2013 | 24 | 2013 |
| The Dutch invention of the rotor machine, 1915–1923 K De Leeuw Cryptologia 27 (1), 73-94, 2003 | 15 | 2003 |
| A homophonic substitution in the archives of the last great pensionary of Holland K de Leeuw, H van der Meer Cryptologia 17 (3), 225-236, 1993 | 8 | 1993 |
| The Institution of Modern Cryptology in the Netherlands and in the Netherlands East Indies, 1914–1935 K De Leeuw Intelligence and National Security 30 (1), 26-46, 2015 | 6 | 2015 |
| Cryptology and Statecraft in the Dutch Republic K De Leeuw Dissertatie Universiteit van Amsterdam, 2000 | 6 | 2000 |
| Cryptology in the Dutch Republic: a case-study K De Leeuw The History of Information Security, 327-367, 2007 | 5 | 2007 |
| Keys with nomenclatures in the early modern Europe B Megyesi, C Tudor, B Láng, A Lehofer, N Kopal, K de Leeuw, ... Cryptologia 48 (2), 97-139, 2024 | 4 | 2024 |
| Intelligence and the emergence of the information society in Eighteenth-Century Britain J Black The History of Information Security, 369-379, 2007 | 3 | 2007 |
| Books, Science and the Rise of the Black Chambers in Early Modern Europe K De Leeuw Geheime Post. Kryptologie und Steganographie der diplomatischen …, 2015 | 2 | 2015 |
| JOHANN FRIEDRICH EULER (1741–1800): MATHEMATICIAN AND CRYPTOLOGIST AT THE COURT OF THE DUTCH STADHOLDER WILLIAM V K de Leeuw Cryptologia 25 (4), 256-274, 2001 | 2 | 2001 |
| A turning grille from the ancestral castle of the Dutch Stadtholders K de Leeuw, H van der Meer Cryptologia 19 (2), 153-165, 1995 | 2 | 1995 |
| Een Lexicaal Geheimschriftvan Wilhelmina van Pruisen op Hampton Court K De Leeuw De Achttiende Eeuw 27, 97-126, 1995 | 2 | 1995 |
| Informatics and Secondary Education in the Netherlands K de Leeuw, A Ponse | 1 | 2008 |
| The Solving of a Fleissner Grille during an Exercise by the Royal Netherlands Army in 1913. K de Leeuw HistoCrypt, 149:012, 2018 | | 2018 |
| JFW Nuboer and the Reintroduction of Machine Cryptography by the Royal Netherlands Navy, 1915–1940 K De Leeuw Cryptologia 39 (2), 157-172, 2015 | | 2015 |
| Kryptographie und Steganographie im Natuerlichen Zauberbuch Simon Witgeests (1679) K De Leeuw Simpliciana. Schriften der Grimmelshausen-Gesellschaft 36, 259-272, 2014 | | 2014 |
| Review of Forschungsstelle Langeveld: Duits Afluisterstation in bezet Nederland by Hans Knap K de Leeuw Cryptologia 37 (2), 162-166, 2013 | | 2013 |
