Sirvi Autor "van Kampen, Florentijn" järgi

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A new perspective on Dutch WWI codebreaking with its international ramifications
(Tartu University Library, 2024) Jacobs, Bart; van Kampen, Florentijn; Waldispühl, Michelle; Megyesi, Beáta
During the First World War, the Netherlands maintained a stance of carefully guarded neutrality. International tele communications in the form of telephone and telegraph were closely monitored and censored by so-called censorbureaus. In 2019 new files were declassified and released to the Dutch National Archive about the secensorship bureaus at Amsterdam and Rotterdam, covering 1914 to 1918. They provide detailed insight in the day-to-day business, the codebreaking efforts and specific cryptanalytic results. The material provides a completely new perspective on the genesis of modern Dutch codebreaking. This article gives a first survey of the development of these interception bureaus. It analyses their pioneering codebreaking activities and presents historic material on German diplomatic ciphers. Also, it provides new insight into the mysterious sale in 1919 of German codebooks from the Netherlands to the United States, as reported earlier in the literature.
Dutch Cryptanalysis of Four American Diplomatic Codes in World War I
(Tartu University Library, 2025) van Kampen, Florentijn; Antal, Eugen; Marák, Pavol
"During the First World War, the Netherlands carefully maintained a neutral position. To guard this neutrality, the Dutch authorities monitored the activities of the belligerent surrounding countries. International telecommunications via telephone and telegraph were closely monitored and censored by censorbureaus. In 2019, the Dutch intelligence and security service released a dossier about these censorbureaus to the Dutch National Archive. In that dossier, a previously unknown history of two groups of pioneering codebreakers based at the censorbureaus in Amsterdam and Rotterdam, was uncovered. In 2024, a first publication appeared about this dossier, with particular emphasis on how the local staff successfully broke German codes. Additionally, the Dutch codebreakers successfully broke four American diplomatic codes between June and December 1918. This breakthrough enabled Dutch intelligence to monitor secret diplomatic traffic between American officials in the Netherlands and Washington during and after World War I. This paper examines the systematic cryptanalysis of U.S. Department of State communications by Dutch codebreakers. Through analysis of original documents and surviving codebooks, it identifies the compromised diplomatic codes and places these findings in a broader historical perspective."