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+\documentclass[a5paper]{scrartcl}
+\parindent0pt
+% \usepackage{fontspec}
+% \defaultfontfeatures{Ligatures={NoRequired, NoCommon, NoContextual}}
+%······································································%
+\usepackage {enigma}
+%%·····································································%
+%% The first machine will be used for encryption of our plain text.
+\defineenigma {encryption}
+\setupenigma {encryption} {
+ other_chars = yes,
+ day_key = B V III II 12 03 01 GI JV KZ WM PU QY AD CN ET FL,
+ rotor_setting = ben,
+}
+%%·····································································%
+%% This second machine below will be used to decrypt the string. It is
+%% initialized with exactly the same settings as the first one. The
+%% reason for this is that we can’t reuse the “encryption” machine as it
+%% will already have progressed to some later state after the
+%% encryption. Applying it on the ciphertext would yield a totally
+%% different string. Hence the need for another machine.
+\defineenigma{decryption}
+\setupenigma{decryption}{
+ other_chars = yes,
+ day_key = B V III II 12 03 01 GI JV KZ WM PU QY AD CN ET FL,
+ rotor_setting = ben,
+}
+%%·····································································%
+\begin{document}
+
+%%·····································································%
+%% Ciphertext in the PDF. Rely on the addressee to decrypt the document
+%% externally.
+\startencryption
+ Never underestimate the amount of money, time, and effort someone will expend to thwart a security system.
+\stopencryption
+
+%%·····································································%
+%% Input string generated with:
+%% mtxrun --script t-enigma \
+%% --setup="day_key=B V III II 12 03 01 GI JV KZ WM PU QY AD CN ET FL,\
+%% rotor_setting=ben,\
+%% other_chars=yes"\
+%% --text="Never underestimate the amount of money,\
+%% time, and effort someone will expend to\
+%% thwart a security system."
+\startdecryption
+ aqsnwyxgqarpuzrdktscbslaqmdhyonywxkwhcdgphvuqsspfjwhlszahygjbzmfpcpbniahvfcuradntepxsfchnn
+\stopdecryption
+%%·····································································%
+\end{document}