Conference article

The Zschweigert Cryptograph – A Remarkable Early Encryption Machine

Klaus Schmeh
Private Scholar

Download articlehttps://doi.org/10.3384/ecp2020171016

Published in: Proceedings of the 3rd International Conference on Historical Cryptology HistoCrypt 2020

Linköping Electronic Conference Proceedings 171:16, p. 126-134

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Published: 2020-05-19

ISBN: 978-91-7929-827-2

ISSN: 1650-3686 (print), 1650-3740 (online)

Abstract

The Zschweigert Cryptograph is one of the many cipher machine designs developed in the years following the First World War (1914-1918). It was invented by textile engineer Rudolf Zschweigert, who had designed programmable stitching machines before and apparently transfered his computing expertise to cryptology. Unlike the Enigma and as good as all other crypto devices of the time, the Zschweigert Cryptograph implements a transposition cipher, not a substitution cipher. To the author’s knowledge, it was the first encryption machine that worked with keys provided on punched cards. The goal of this paper is to introduce the Zschweigert Cryptograph and its history, to provide a mathematical specification of its encryption algorithm, and to explore how it can be cryptanalyzed. It will be shown that the Zschweigert Cryptograph, which was probably never used in practice, was insecure even by the standards of the 1920s and not convenient enough to compete with other encryption machines of the time.

Keywords

Zschweigert Cryptograph; Rudolf Zschweigert; encryption machine; transposition cipher

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