Konferensartikel

The Use of Project Gutenberg and Hexagram Statistics to Help Solve Famous Unsolved Ciphers

Richard Bean
School of Information Technology and Electrical Engineering, University of Queensland, Australia

Ladda ner artikelhttps://doi.org/10.3384/ecp2020171005

Ingår i: Proceedings of the 3rd International Conference on Historical Cryptology HistoCrypt 2020

Linköping Electronic Conference Proceedings 171:5, s. 31-35

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Publicerad: 2020-05-19

ISBN: 978-91-7929-827-2

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

Abstract

Project Gutenberg, begun by Michael Hart in 1971, is an attempt to make public do-main electronic texts available to the pub-lic in an easily available and useable form. The number of available texts reached 60,000 by 2019. Classical cryptanalysis methods rely on the development and use of high-quality frequency tables of letter arrangements from a variety of sources. As the amount of text grows, frequency ta-bles of higher orders can be developed and may provide more solving power for clas-sical cryptographic algorithms. As a side-e?ect of the availability of a wide range of public domain texts, we were able to develop hexagram frequency tables of let-ters in the English language which were then a crucial factor to solving an unsolved transposition cipher of Mahon and Gillo-gly (2008). The texts themselves were then used as input to solve a book cipher of Thouless (1948) using the same scoring method.

Nyckelord

cryptanalysis; frequency tables; hill climbing; book ciphers

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